Exhibit 2.4
 
                                AMENDMENT NO. 3
                                      to
                         AGREEMENT AND PLAN OF MERGER
                                     among
                       TM TRANSITORY MERGER CORPORATION,
                                  TISM, INC.
                                      and
                              THOMAS S. MONAGHAN,
      Individually and as Trustee of The Thomas S. Monaghan Living Trust

     AMENDMENT NO. 3 TO AGREEMENT AND PLAN OF MERGER (this "AMENDMENT"), dated
December 18, 1998, by and among TM Transitory Merger Corporation, a Michigan
corporation ("BUYER"), TISM, Inc., a Michigan corporation ("TISM"), and Thomas
S. Monaghan, individually and as trustee of The Thomas S. Monaghan Living Trust
(the "PRINCIPAL STOCKHOLDER").

                                  WITNESSETH:

     WHEREAS, Buyer, TISM and the Principal Stockholder are parties to an
Agreement and Plan of Merger dated as of September 25, 1998, as amended by
Amendments No.1 and No. 2 thereto dated as of November 24, 1998 and November 24,
1998, respectively (the "AGREEMENT");

     NOW, THEREFORE, in consideration of the premises and mutual agreements set
forth herein and in the Agreement, the parties hereto agree as follows:

     1.   Section 1.01(a) of the Agreement is hereby amended by inserting
immediately after the words "all obligations" in the definition of
"Indebtedness" included therein, the words "(other than obligations solely
between or among TISM and its subsidiaries)".

     2.   Section 2.01(c) of the Agreement is hereby deleted in its entirety,
and Section 2.01(d) is renumbered Section 2.01(c).

     3.   Section 5.03 of the Agreement is hereby amended to read in its
entirety as follows:

          "The execution, delivery and performance by Buyer of this Agreement
          and the consummation of the transactions contemplated hereby require
          no material action by or in respect of, or filing with, any
          governmental body, agency or official, including compliance with any
          applicable requirements of the HSR Act, other than the

                                       1

 
          filing with the Department of Consumer and Industry Services,
          Corporations, Securities and Land Development Bureau of the State of
          Michigan of the certificate of merger pursuant to Michigan Law."

     4.   Schedule 6.01 of the Agreement is hereby amended to add the following
sentence after the last sentence thereof:

          "Prior to the Closing Date, the name of Storefinder, Inc. a subsidiary
          of the Company, will be changed to Domino's Pizza International
          Payroll Services, Inc., and the name of Domino's Pizza International
          Payroll Services, Inc., an indirect subsidiary of the Company, will be
          changed to Domino's, Inc., and each such Company's certificate of
          incorporation will be amended to reflect this change."

     5.   Section 6.05 is hereby amended to read in its entirety as follows:

          "Prior to the Closing Date, TISM shall exercise the Option in exchange
          for a promissory note. The Principal Stockholder shall purchase from
          TISM the same number of TISM shares acquired pursuant to the option in
          exchange for one or more promissory notes in an amount that is, in the
          aggregate, larger than the principal amount of the note issued by TISM
          to exercise the Option. The Principal Stockholder and TISM shall net
          their respective notes referred to in the previous sentence, resulting
          in a net obligation of the Principal Stockholder to TISM. On or prior
          to the Closing Date, TISM will make a pro rata redemption from each of
          the Stockholders of shares of the then-outstanding Common Stock in an
          amount of such notes equal to the amount of such obligation of the
          Principal Stockholder to TISM."

     6.   (a)  Section 1.01(a) of the Agreement is hereby amended by inserting
the following additional definition immediately following the definition of
"Disclosure Schedules" therein:

     "ACCOUNTING EFFECTIVE DATE' means Sunday, December 20, 1998."

     (b)  Section 1.01(a) of the Agreement is hereby amended by inserting the
following proviso at the end of the definition of "Stock Consideration" therein:

                                      -2-

 
             "provided, however, that in the case of Stock Consideration
             consisting of shares of Class A Common Stock of the Surviving
             Corporation, all of such Class A Common Stock shall be payable in
             the form of shares of Class A-1 Common Stock."

     (c)  Section 2.01(a) of the Agreement is hereby amended by appending the
following proviso to the end of such paragraph:

          "; provided, that (i) for accounting purposes only, the Merger will be
deemed to be effective as of the Accounting Effective Date, (ii) subject to the
other terms and conditions of this Agreement, all of the revenues, income, costs
and expenses of TISM and its Subsidiaries for the period from the close of
business on the Accounting Effective Date (the "CLOSE OF BUSINESS") through the
Closing Date shall be for the benefit or detriment of the Surviving Corporation
and not the Stockholders of TISM and (iii) during such period TISM shall not
declare or pay any dividend on, or make any other distribution in respect of its
capital stock or otherwise make any payments of any kind to its Stockholders or
any of its Affiliates other than as expressly provided herein."

     (d)  Section 2.05(a) of the Agreement is hereby amended by replacing clause
(x) thereof in its entirety with the following:

             "(x) fairly present the consolidated financial position of the
Company and the Subsidiaries as at the Close of Business in accordance with
generally accepted accounting principles applied on a basis consistent with
those used in the preparation of the December Balance Sheet,"

     (e)  Section 9.05(a) of the Agreement is hereby amended by inserting
therein, immediately after the words "provided, that Loss shall not include any
Tax of TISM, the Surviving Corporation, the Company or the Subsidiaries arising
as a result of the assumption of liabilities in excess of basis by the Company
or any Subsidiary", the words:

             "; and provided, further, that there shall be no indemnification
             under this Section 9.05 unless the aggregate amount of Losses
             exceeds $150,000 and then only to the extent of such excess."

     (f)  All references in the Agreement to the "Closing Balance Sheet" are
hereby replaced with the words "Accounting Effective Date Balance Sheet", and
all references in the Agreement to "Closing Capitalization Amount" are hereby
replaced with the words "Accounting Effective Date Capitalization Amount".

                                      -3-

 
     7.   (a)  Section 6.04 of the Agreement is hereby amended by inserting in
the place thereof the following:

               Section 6.04. Noncompetition. (a) The Principal Stockholder
     agrees that during the Non-Competition Period he shall not:

               (i)  engage, either directly or indirectly, as an employee,
          officer, director or consultant, or as a principal for his own account
          or jointly with others, or as a stockholder in any corporation or
          joint stock association, in, or have any investment or other interest
          in, directly or indirectly, any business other than the Company that
          is engaged in the marketing, production or sale of pizza (the
          "BUSINESS") within the United States, or any other country from which
          the Company or any Subsidiary derives revenues, directly or
          indirectly, on or prior to the Closing Date; provided, that nothing
          contained in this Section 6.04 shall prevent the Principal Stockholder
          from owning, directly or indirectly, (i) not more than five percent of
          the outstanding shares of, or not more than five percent of any other
          equity interest in, any Person engaged in the Business and listed or
          traded on a national securities exchange or in an over-the-counter
          securities market or (ii) any financial interest in one or more
          Franchisees (A) the aggregate cost of which shall not exceed
          $10,000,000 without the prior consent of the Surviving Corporation, or
          (B) at any amount with the consent of the Surviving Corporation, which
          consent shall not be unreasonably withheld; and provided further, that
          this Section shall not be deemed to prohibit incidental sales of pizza
          on the premises of charitable, non-profit or educational institutions
          established by the Principal Stockholder or his Affiliates; or

               (ii) himself, or permit any Affiliate to, directly or indirectly,
          employ or solicit, or receive or accept the performance of services by
          any current employee with managerial responsibility or other current
          key employee of the Company or any Subsidiary, except as set forth on
          Schedule 6.04 provided, that nothing in this Section 6.04 shall
          prevent solicitation through general, non-targeted recruitment efforts
          such as advertisements and job listings.

          As used herein, the term "Non-Competition Period" shall mean the
     period beginning on the Closing Date and ending on the later of (x) three
     years after the Closing Date and (y) the date to which the Non-Competition
     Period shall have been from time to time extended pursuant

                                      -4-

 
     to the immediately following sentence. The Buyer shall be entitled to elect
     to make up to two (2) extensions of the Non-Competition Period, with each
     extension to be of one year's duration, such elections to be exercisable by
     notice to the Principal Stockholder (x) prior to three (3) years from the
     Closing Date in the case of the first such extension and (y) prior to four
     (4) years from the Closing Date in the case of the second such extension,
     such notice to be accompanied or preceded in each case by payment of $1.0
     million by bank check or wire transfer of immediately available funds.

          (b)  The Principal Stockholder agrees, from and after the Effective
     Time, that he shall not disclose or use for his own benefit or purposes or
     the benefit or purposes of any other person, firm, partnership, joint
     venture, association, corporation or other business organization, entity or
     enterprise other than the Surviving Corporation and any of its subsidiaries
     or affiliates, any trade secrets, information, data, or other confidential
     information relating to customers, development programs, costs, marketing,
     trading, investment, sales activities, promotion, credit and financial
     data, manufacturing processes, financing methods, plans, or the business
     and affairs of the Surviving Corporation generally, or of any subsidiary or
     affiliate of the Surviving Corporation; provided that the foregoing shall
     not apply to information which is not unique to the Surviving Corporation
     or which is generally known to the industry or the public other than as a
     result of the Principal Stockholder's breach of this covenant.

          (c)  If any provision contained in this Section shall for any reason
     be held invalid, illegal or unenforceable in any respect, such invalidity,
     illegality or unenforceability shall not affect any other provisions of
     this Section, but this Section shall be construed as if such invalid,
     illegal or unenforceable provision had never been contained herein. It is
     the intention of the parties that if any of the restrictions or covenants
     contained herein is held to cover a geographic area or to be for a length
     of time which is not permitted by applicable law, or in any way construed
     to be too broad or to any extent invalid, such provision shall not be
     construed to be null, void and of no effect, but to the extent such
     provision would be valid or enforceable under applicable law, a court of
     competent jurisdiction shall construe and interpret or reform this Section
     to provide for a covenant having the maximum enforceable geographic area,
     time period and other provisions (not greater than those contained herein)
     as shall be valid and enforceable under such applicable law. The Principal
     Stockholder acknowledges that Buyer would be irreparably harmed by any

                                      -5-

 
     breach of this Section and that there would be no adequate remedy at law or
     in damages to compensate Buyer for any such breach. The Principal
     Stockholder agrees that Buyer shall be entitled to injunctive relief
     requiring specific performance by him of this Section and consents to the
     entry thereof.

          (d)  In consideration of the Principal Stockholder agreeing to the
     provisions of clause (a) of this Section, at the Closing, Buyer agrees to
     pay to him the sum of $50,000,000 (the "NONCOMPETE CONSIDERATION") in
     immediately available funds by wire transfer to an account with a bank in
     New York City designated by notice from him to Buyer.

     (b)  Section 6.11 is hereby amended by replacing the text and heading
thereof with the words "[intentionally omitted]".

     9.   (a)  The Buyer hereby waives the provisions of the Agreement solely to
the extent necessary to permit the Company to terminate the Deferred
Compensation Plans and make the required payments to the employees of the
Company pursuant to the Deferred Compensation Plans prior to the Closing Date.

          (b)  The Buyer hereby waives the provisions of the Agreement (other
than Sections 2.05 and 2.06) to permit TISM to make on or prior to December 18,
1998 a distribution to its stockholders of a note receivable from the Principal
Stockholder in the amount of $2,568,031.01 in payment for certain assets listed
on the attached schedule. In addition, the Buyer hereby waives the provisions of
the Agreement solely to the extent necessary (i) to permit certain other
Stockholders of TISM to sell their Shares to the Principal Stockholder prior to
the Closing, such that the ownership of the capital stock of TISM immediately
prior to the Effective Time shall be as set forth on Exhibit A hereto rather
than as set forth in Schedule 4.05 and (ii) to permit TISM to contribute 100% of
the common stock of the Company to Domino's, Inc., a subsidiary of TISM.

          (c)  This Amendment may be executed and delivered in any number of
counterparts which together shall constitute one instrument, and shall be
governed by and construed in accordance with the law of the State of New York,
without regard to the conflict of law rules of such state. This Agreement shall
become effective when signed and delivered by each party hereto.

     10.  Except as specifically amended by this Amendment, the Agreement shall
remain in full force and effect.  Terms defined in the Merger Agreement and not
otherwise defined herein are used herein as so defined.

                                      -6-

 
     IN WITNESS WHEREOF, the parties hereto have executed this Amendment No. 3
to the Agreement as of this 18 day of December, 1998.


                              TM TRANSITORY MERGER CORPORATION


                              By: /s/ Andrew Balson
                                  -------------------------------------
                                  Name:  Andrew Balson
                                  Title: President, Secretary and
                                         Treasurer



                              TISM, INC.


                              By: /s/ Harry J. Silverman
                                  -------------------------------------
                                  Name:  Harry J. Silverman
                                  Title: Vice President

                              /s/ Kathleen Ferrell, As Attorney-in-Fact
                              -----------------------------------------
                              THOMAS S. MONAGHAN,
                              Individually and as Trustee

                                      -7-