The Fourth Monkey Killer starts with a man getting hit by a bus, and in his possession they find a notorious white box tied with black ribbon. In the box? An ear.
Detectives Porter, Nash, and Claire (she has a last name, but she mostly went by Claire) kick into gear, when they realize that this man is the Four Monkey Killer. The Four Monkey Killer kidnaps women, delivers their ears, eyes, and tongue in succession before finally killing the woman. And here he is, about to deliver an ear, laid out in front of them dead!