Former detective Brenner has become an ambulance driver and finds himself, much to his dismay, caught up in a war between two rival first aid organizations.
Stingo, a young writer, moves to Brooklyn in 1947 to begin work on his first novel. As he becomes friendly with Sophie and her lover Nathan, he learns that she is a Holocaust survivor. Flashbacks reveal her harrowing story, from pre-war prosperity to Auschwitz. In the present, Sophie and Nathan's relationship increasingly unravels as Stingo grows closer to Sophie and Nathan's fragile mental state becomes ever more apparent.