![Law of Gravity](https://image.tmdb.org/t/p/w500/c4Fb33OxqPcIptf7EZvv2Yrpxhh.jpg)
Grissom returns from his sabbatical; Keppler is put into a compromising position when the bodies of a Trenton police officer and a hooker are found in a hotel room. The man who found them is a retired New Jersey cop and close friend to Keppler, who doesn't reveal their relationship.