In the late 1970s, a French horror fan named Stéphane Bourgoin becomes obsessed with serial killers. He manages a used bookstore specializing in crime fiction and begins writing articles on the topic, fashioning himself into an expert on all things morbid. And his career really takes off when he scores the opportunity of his dreams: to interview actual serial killers in prison. But the more influential he becomes, the closer he’ll get to being found out: as the ultimate fanboy and a total fraud.

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