Klaus and Doris have just made the discovery of their lives – a complete Neanderthal skeleton buried in a newly opened sinkhole. But on removing it, something else tumbles free. Something that switches on, and then calls home. Soon the owners are coming back, and nothing will stop their ruthless search for their lost prize. Gruesome corpses begin to pile up, and Detective Ed Heisner of the Berlin Police is assigned to a case like nothing he has ever experienced before in his life. Heisner must stay one step ahead of a group of secretive Special Forces soldiers also tracking the strange device, while trying to find an unearthly group of killers that are torturing, burning, and obliterating their victims all the way across the city.