Set in 1935 Czechoslovakia, the story follows psychiatrist Viktor Kosárek as he begins working at a remote asylum for the criminally insane, where he seeks to uncover the "Devil Aspect," a theory suggesting a shared demonic influence among the inmates. As he delves into the minds of the asylum's most notorious patients, a series of gruesome murders in Prague raises fears of a serial killer on the loose. The narrative weaves together psychological intrigue and historical tension, exploring themes of evil and the human psyche against the backdrop of a Europe on the brink of war.
