A man of reason and science, Colin Cellars has earned a reputation as a top crime scene investigator. But Cellars finds himself disgraced after a bizarre episode that led to a horrifying shoot-out right in front of his eyes. What Cellars thinks he knows about the victim's identity�and her death�has plunged him into a deadly search for a killer who may or may not be of this world.

Meanwhile, as Cellars investigates a case involving dozens of missing victims, he realizes that the three people he trusts most each hold a piece to the puzzle�and that they have their own ideas about what to do with the information. Soon Cellars finds himself on a chilling and unforgettable voyage, one that leads through tunnels of violence and intrigue and out into the unknown.