Daisy Kenyon is a Manhattan commercial artist having an affair with an arrogant and overbearing but successful lawyer named Dan O’Mara. O’Mara is married and has children. Daisy meets a single man, a war veteran named Peter Lapham, and after a brief and hesitant courtship decides to marry him, although she is still in love with Dan.

On a trip to the New York Aquarium with her third-grade class, a teacher discovers a dead body.