Max Rose (Jerry Lewis) is an aging jazz pianist who learns that his wife of 65 years may have been unfaithful to him. Though his career was not everything he had hoped it would be, Max always felt like a success because his beautiful, elegant wife Eva (Claire Bloom) was by his side. While going through her things, however, Max discovers an object bearing an intimate inscription from another man, a shocking revelation that leads him to believe his entire marriage, indeed, his entire life, was built on a lie. Coping with anger, withdrawal and his fragile health, Max embarks on an exploration of his past, all the while searching for Eva’s mystery suitor, hoping to find the answers he needs to be at peace.