Aislinn Cain and the Serial Crimes Tracking Unit are being sent to the hottest place in North America to investigate mummified remains that were found in Death Valley. When Xavier Reece uncovers elemental mercury in the heart of one of the mummies, they discover there is more than Mother Nature at work.

The victims have matching injuries, but only one of the bodies reveals the liquid metal, raising questions about how many killers are using the valley as a dumping ground. The team will have to use extraordinary means to connect all the victims to a single killer. However, with most of the victims unidentifiable due to the condition of the remains, their usual procedures of investigation are impossible.

With 32 bodies already found, how high will the body count rise before Aislinn Cain and the SCTU can capture this killer?