Hannah, 12, is tired of remembering, and is embarrassed by her grandfather, who rants and raves at the mention of the Nazis. Her mother's explanations of how her grandparents and great-aunt lost all family and friends during that time have little effect. Then, during a Passover Seder, Hannah is chosen to open the door to welcome the prophet Elijah. As she does so, she is transported to a village in Poland in the 1940s, where everyone thinks that she is Chaya, who has just recovered from a serious illness.

She is captured by the Nazis and taken to a death camp, where she is befriended by a young girl named Rivka, who teaches her how to fight the dehumanizing processes of the camp and hold onto her identity. When at last their luck runs out and Rivka is chosen, Hannah/Chaya, in an almost impulsive act of self-sacrifice, goes in her stead. As the door to the gas chamber closes behind her, she is returned to the door of her grandparents' apartment, waiting for Elijah.

Also have the movie made from the book.