In this 1964 screwball comedy, Jack Lemmon plays a family man who helps his recently divorced best friend claim a substantial inheritance by posing as her husband. As their ruse spirals out of control, Sam's wholesome image is put to the test in his advertising job, where a recent promotion relies on his moral appearance. The film navigates a complex web of love triangles and deception, ultimately leading to a reconciliation that tests the limits of honesty and relationships.