A student kidnapped from the park. Nineteen-year-old Sophie disappears one summer afternoon. She wakes up to find herself locked inside a derelict warehouse, surrounded by five objects. If she uses them wisely, she will escape her prison. Otherwise she will die. An investigator running out of time. Sophie's distraught father calls in the one man who can help find his daughter: unique investigator Colter Shaw. Raised in the wilderness by survivalist parents, he is an expert tracker with a forensic mind trained to solve the most challenging cases. But this will be a test even for him. A killer playing a dangerous game. Soon a blogger called Henry is abducted - left to die in the dark heart of a remote forest - and the whole case gets turned on its head. Because this killer isn't following the rules; he's changing them. One murder at a time.