American businesswoman Sarah Leonard is supervising the construction of a major new international hotel in post-Cold War Warsaw. If the job doesn't come in on time and under budget, Sarah will be out of a job. Shockingly, a headless body is discovered in a sewer tunnel at the construction site. Polish authorities pressure the Warsaw police to solve the case quickly, even if they have to invent a murderer, lest the hotel chain withdraw its investment dollars. Unluckily for the authorities, the case is assigned to Komisarz Stefan Rej. Rej wants a real investigation and real justice, particularly once his investigation turns up evidence that more than one person has disappeared or been slaughtered near the hotel site. The location is linked to the ancient legend of the Tunnel Child, a murderous creature with the face of an angel. Rumors insist that the Nazis attempted to create such a being with their warped science. Who, or what, are Sarah and Rej chasing?