Hannibal Rising by Thomas Harris

The novel explores the early life of a young boy who endures the traumatic experiences of World War II, including the brutal murder of his family. As he grows up, he becomes consumed by a desire for revenge against those responsible for his sister's death. The story follows his transformation into a calculating and intelligent individual, honing his skills and intellect to track down and exact vengeance on the perpetrators. This journey reveals the origins of his complex psyche and the development of his notorious persona.