In this drama of romantic intrigue and infidelity, Sam and Christine Bonner (Arthur Hill and Jane Fonda) are a married couple whose relationship has hit a rough spot. While Sam loves Christina very much and would do anything for her, she feels unsatisfied and suffocated by him; she wants more space for herself and would like to have a baby. Sam is more than willing to help, but matters become more complicated when he introduces Christine to Murray Logan (Peter Finch), a friend from work, and his wife Sybil (Angela Lansbury). Murray and Sybil are not at all happy together; ever since an auto wreck claimed the life of their son, Sybil has been emotionally on edge and blames her husband for the death of her child. When Murray meets Christine, he finds himself attracted to her; she is also interested in him, but neither are in a position to do anything about it. Sam arranges for the two couples to take a vacation to Greece together, hoping a change of scenery will bring a spark back into their lives. However, Sam's father Frederick (Alexander Knox) falls ill just as the couples are about to leave, and he's forced to stay behind. While in Greece, Murray and Christine finally succumb to their desires and begin an affair; an angry Sybil retaliates by both having a fling with a local man and spilling the beans to Sam about Murray and his wife. John Houseman, later to become famous as an actor, served as a producer on this film.