The fourth monkey

He's a perfectionist, he's elusive, he's a psychopath. He's nicknamed the Monkey Killer. Detective Sam Porter has been chasing him for five long years, all the while receiving packages with horrifying contents. Every package delivered contains a body part from a murder victim. But now there's been a significant turn in the search: Porter got his hands on the killer's diary. Will he be able to get a closer look at the madman's personality from his notes? Can she discern the motives behind his actions? If he succeeds, he could find Monkey's next victim before it's too late.