In July 1991, the United States discovers, in shock, the full extent of the crimes committed by serial killer Jeffrey Dahmer. But no one is more deeply affected than the murderer’s parents, especially his father Lionel.

To understand the nature of his son’s psychosis and what drove him to commit such horrors, Lionel Dahmer methodically examines every factor that may have contributed to his madness. Fascinating and heartbreaking, this unprecedented work is the confession of a father who must “face the saddest truth a human being can know – that his child has in some way crossed the line separating the human from the monstrous”.