Veteran reporter Jack McEvoy has taken down Killers before, but when a woman he had a one night stand with as murdered in a particular brutal way, he reaches or realizes he might be facing a Criminal Mind and like one he's ever encountered. Track investigates, against the warnings of the police in his editor, and makes a shock and discovery that connects the crime to other mysterious deaths across the country. Undetected by law enforcement, a vicious killer has been hunting women, he's in genetic data to select and stop his victims. Uncovering the murkiest corners of the dark web, Jack races to find and protect the last Source who can lead them to his quarry. But the killer has already chose his next Target and he's ready to strike.