1927: Mary Rourke --- a Hollywood studio fixer --- is called urgently to the palatial home of Norma Carlton, one of the most recognizable stars in American silent film. Norma has been working on the secret film everyone is openly talking about: a terrifying horror picture called The Devil’s Playground that is rumored to have unleashed a curse on everyone involved in the production. Mary finds Norma’s cold, dead body, and she wonders for just a moment if these dark rumors could be true. 1967: Paul Conway, a journalist and self-professed film aficionado, is on the trail of a tantalizing rumor. He has heard that a single copy of The Devil’s Playground may exist. He knows his Hollywood history, and he knows the film endured myriad tragedies and ended up lost to time.

Czechoslovakia, 1935: Psychiatrist Viktor Kosárek arrives at the infamous Hrad Orlu Asylum for the Criminally Insane, which houses six inmates --- the country's most treacherous killers --- known to the terrified public as the Devil's Six. Viktor intends to use a new medical technique to prove that these patients share a common archetype of evil, a phenomenon he calls The Devil Aspect. Yet as he begins to learn the stunning secrets of these patients, he must face the unnerving possibility that they may share a darker truth. Meanwhile, in Prague, fear grips the city as a phantom serial killer emerges in the dark alleys. Police investigator Lukas Smolak, desperate to locate the culprit (a copycat of Jack the Ripper), turns to Viktor and the doctors at Hrad Orlu for their expertise with the psychotic criminal mind.