Book 1: Aislinn Cain's life is a horror story. When the US Marshals Serial Crimes Tracking Unit comes knocking at Aislinn Cain's door, she is given a chance to use her past to save other people's futures. She has survived attacks by two different serial killers and devoted her life to studying the darker side of human history. She can give them a glimpse into his twisted world, but not without a cost. Can she afford to help, knowing that the cost could be her own humanity?

Book 2: In the cold, dark nights of Alaska, a hunter is stalking his prey. Once found, he takes them into the woods and skins them alive, prolonging the experience as much as he can, but the satisfaction always wanes.

Aislinn Cain and the Serial Crimes Tracking Unit have just finished up another case when they get the call. The team must overcome the hostile locals and harsh climate to catch a killer before he steals the life of another woman.

Book 3: 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?

Content warning: These audiobooks contains detailed descriptions of violence which some listeners may find upsetting.