Married Life

Do you know what really goes on in the mind of the person with whom you sleep?

1949, successful middle-aged businessman Harry Allen, is having an affair with considerably younger war widow Kay Nesbitt. Feeling rejuvenated by his emotional reawakening, he confides in his best friend Richard Langley and encourages him to visit his mistress in order to alleviate her loneliness. Richard complies and immediately finds himself attracted to the young woman.

Richard discovers Harry's wife Pat, oblivious to her husband's ongoing tryst, is engaged in an affair of her own with John O'Brien. Anxious to cement his blossoming relationship with Kay, Richard separately urges Harry and Kay to remain with each other.

Harry, however, is determined to marry Kay. Certain divorce would hurt and humiliate Pat too much, he decides to kill her by lacing the digestive aid she takes on a daily basis with poison. He visits Kay, who unexpectedly ends their relationship. Harry departs, then returns to ask for all the correspondence he has sent her, only to discover Kay in the arms of Richard, who had secreted himself upstairs. Realization sets in, and Harry races home to stop his wife from taking her nightly dose of medication.

Richard and Kay eventually wed and become part of the Allens' social circle, which includes John O'Brien and his wife. Neither Harry nor Pat are aware each other's former lover continues to be on the periphery of their healing marriage.