This section is from the book "The Law Of Contracts", by William Herbert Page. Also available from Amazon: Commercial Contracts: A Practical Guide to Deals, Contracts, Agreements and Promises.
Contracts in which the consideration is furnished to the promisor by one of the adversary parties, and the promise is made for the sole benefit of the other, do not appear to be common. An example of a case where A makes a promise to B and C, for which the consideration is to be furnished by B, and. C is the sole beneficiary can be suggested where A is indebted to B, and A, B and C agree that A shall pay such amount to C and shall be discharged from liability to B. Here there is a consideration for A's promise in the discharge of his debt to B. It is not necessary that there should be any consideration between B and C, nor any moving from C to A.1 It is quite likely that, in fact, many contracts in which A makes a promise to B for the benefit of X are really cases of this type, and X was really a party to such contract; but if X can sue, even if not a party to the contract, his actual participation in such contract is likely to escape attention.