Michael Mason is an American pickpocket living in Paris who finds himself hunted by the CIA when he steals a bag that contains more than just a wallet. Sean Briar, the field agent on the case, soon realises that Michael is just a pawn in a much bigger game and is also his best asset to uncover a large-scale conspiracy.

When an American family is invited to spend the weekend at the idyllic country estate of a charming British family they befriended on vacation, what begins as a dream holiday soon warps into a snarled psychological nightmare.

Distraught, confused, and half-wild with fear, Sarah Carter emerges alone from the Appalachian cave system where she encountered unspeakable terrors. Unable to plausibly explain to the authorities what happened - or why she's covered in her friends' blood - Sarah is forced back to the subterranean depths to help locate her five missing companions.