The FBI estimates that only one in five serial killers fall into the hands of the law. The rest continue to live among us. Agent Lee Harper (Monroe) is on the hunt for one such elusive monster nicknamed Longshanks (Cage). For over a decade, his victims have been entire families whose members have mystically killed each other. The closer Agent Harper gets to unraveling the killer’s identity, the more clearly she realizes there is a connection between the two. Any wrong decision she makes will lead to the death of yet another family.