Stéphane Bourgoin's success as a world-renowned serial killer expert progressed alongside the rise of serial killers in America and the explosive growth of the lucrative true-crime industry. But when the 4th Eye, a collective of vigilante online sleuths, embarks on an investigation into his life and work, they discover his career was based on a series of dark lies.

Anchored by reporting from The New Yorker's Lauren Collins, we follow the dramatic twists and turns of Stéphane Bourgoin's story. As his career continues to flourish, the 4th Eye's hunt for the truth reveals that something far darker lies beneath the surface of his fame. The online sleuths work to stop him before more damage is done.

As the mysteries of Bourgoin's past reveal the seeds of his dark obsessions, Lauren Collins continues investigating many alarming unanswered questions. We hear from the victims in this story and delve into the larger themes and questions raised about our insatiable appetite for true crime and the strange compulsions of the human psyche.