THe book explains he had a sister and she was eaten and some other dramatic things. I don\'t want to spoil it all. But anyways, it damages him and he is haunted by dreams of her, in the book. The movie leaves this whole thing out. In the book, Hannibal and Clarice save each other from their inner demons. Hannibal teaches Clarice about not being afraid and such. And she takes away his pain and mourning for his dead sister.