Set in New York after World War II, it is the story of a young carefree socialite, Grady McNeil, whose parents leave her alone in their Fifth Avenue penthouse for the summer. Left to her own devices, Grady turns up the heat on the secret affair she's been having with a Brooklyn-born Jewish war veteran who works as a parking lot attendant. As the season passes, the romance turns more serious and morally ambiguous, and Grady must eventually make a series of decisions that will forever affect her life and the lives of everyone around her.