Detective Jack Foster rejoins the police department to take over the investigation of what appears to be mere political blackmail. Soon, he's faced with a gruesome ritual murder in a sealed room that no one could have entered or exited without being seen. Along with his new partner Harvey Whitman, an expert on cults, Foster dives deep into the shadows of Arkham. The case will get even darker when they find it is related to three witches that escaped the Salem trials in 1693 — and a conspiracy that could put an end to the world.