S1, E4: In the 1980s, Kansas City was gripped by terror as young men began to vanish. Robert Berdella, an unassuming local figure, hid a gruesome secret. His home was a den of torture where his victims were subjected to unimaginable suffering before he brutally murdered them. For years Berdella evaded suspicion, but when one victim managed to escape, police sought to unmask this sadistic killer.