At law a release given by a joint promisee discharged the debt as to all the promisees.1 Thus a release given by one partner binds his co-partners2 It has been held that a release by one of two or more joint promisees does not necessarily bar the rights of the other promisees in equity.3 If a mortgage is released by all of the joint mortgagees except one and the debt is not released, the mortgagee who did not release such mortgage may enforce it in equity.4 If the release has been given by a joint promisee in fraud of the rights of his co-promisees and in collusion with the promisor, equity will grant affirmative relief, and set such release aside.5