"Servatis a periculum; servatis a maleficum." [Save us from danger; save us from evil.] The year is 1926, and twenty one year old Jack Winona gets the privilege of investigating New York City's most gruesome homicide in decades. When it is decided that he must go undercover to find the killer, he encounters much more terrifying forces at play, and it is only a matter of time before his own demons resurface with them.