When FBI special agent Luke Kendrick discovers chilling evidence of dozens of victims at a crime scene in London, he recognizes the calling card of the notorious H.H. Holmes Society. Now the group's been linked to a Scottish castle turned B&B - where guests check in but never check out. Arriving at the sinister Graystone Castle posed as a tourist, Luke is joined by Special Agent Carly MacDonald, and the pair is immediately confronted by dangers hidden in the castle's depths. With guests disappearing and a network of killers closing in, Luke and Carly have only each other to rely on.
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