What caused Jack Quaid to slowly drive away the love of his life? What made him arrive home late one night, sit in front of a camera pouring out his soul, before taking a shotgun and ending his life? When Detective Alex Keaton arrives at the scene, it has all the signs of a straightforward suicide. Alex is struggling with her own demons following her partner's violent death some months earlier, but when Jack's suicide brings up some strange questions, the tenacious, no-nonsense cop she once was starts to show itself again. Why did Jack feel responsible for a murder he had nothing to do with?...

Alex Keaton returns. Sophie is dead. Shot by Alex as she had no choice other than to stop the monster inside of her. With Jack Quaid's list of murderers and psychopaths locked away in her draw, Alex's quest for the truth and justice sees her risking her life as those around her are dying at the hands of monsters. With the prospect of catching killers in the act it was a risk she was willing to take. When faced with the truth Alex was left with one choice to make. But not even she knew the enormity of the task that lay ahead.