The shocking story of serial killer Marcel Petiot, a respected French doctor and town mayor who is also a cunning, violent psychopath. During World War II, as Hitler's forces march into France spreading fear and paranoia throughout the country, Petiot uses the confusion to prey on those most in fear for their lives - the Jews, partisans and criminals desperate to flee the Nazi regime. Posing as a resistance operative, he creates an elaborate, fictional "escape network", offering to help the oppressed flee from the occupied zone to the freedom of South America. Yet there is no network. Instead, Petiot leads his victims to a secret location and murders them. As the corpses begin to pile up, soon Petiot is being hunted down both by the Gestapo, who believe he is a member of the Resistance and the French police, who fear that this intelligent, charismatic Dr could be the deadliest serial killer to have ever stalked the streets of Paris.