When a drug-riddled party turns deadly, numerous teen partygoers land in trouble---including Grace's niece. As the team hunts for the drug pusher, Grace's temporary partner tries to prove her worth by scoring important leads in the case.

The team investigates the death of a woman, but Grace is lured to the prime suspect, a high-profile architect with an unconventional sex life. Meanwhile, Ham partners with Grace again, hoping the union will rekindle their twisty romance. In other developments, Bobby's undercover undertaking reaches an explosive conclusion, and Clay forms a bond with a youngster.