As a longtime member of the FBI's Special Crimes Unit, Grayson Sheridan has learned not to be surprised by the unusual and the macabre -- but Salem is different. Evidence of Satanic activities and the disappearance of three strangers to the town are what brought Salem to the attention of the SCU, and when Gray arrives to find his undercover partner vanished, he knows that whatever's hiding in the seemingly peaceful town is deadly. But what actually hides in the shadows and secrets of Salem is unlike anything the agents have ever encountered.