Law of Gravity

Keppler finds himself having recurring nightmares about an incident many years ago in New Jersey, which get worse when a friend of his, a retired cop from Trenton and the father of his late girlfriend comes into town to visit. Soon, the bodies of a New Jersey police officer and a hooker are found shot to death in a hotel room, the left hand of the dead woman cut off. To Keppler's dismay, the one who found the bodies is none other than his friend. Back at the lab, Grissom returns from his sabbatical and learns about the friction caused by Keppler while he was away.