Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Morality play

A couple who are close friends of ours recommended this book. The man is a Polish American who was born in a Jewish slave camp during WWII. If the parallel to the fairy tale of Hansel and Gretel doesn't bother them, then it doesn't bother me. This tale is well-written, well-researched, and deeply troubling. The characters are complex and well-developed; the entire novel is a beautifully orchestrated morality play. One part of the story is so horrific that I skipped five pages or so.