After the body of Vicky Riggs is found, Benson and Stabler delve into her private life and finally learn that in addition to being a respected lawyer, she was also a stripper. A surveillance photo leads them to Linus McKellen, her boss' husband, who was also having an affair with her. There isn't enough evidence to prove he murdered Vicky, but when Vicky's co-worker at the club, Josie Post, is also found murdered, DNA proves that McKellen's semen was found in her body, despite his disabled wife Tessa's conviction that he would never murder anyone. Suspicion turns on Tessa herself once the detectives interview the only man who seems capable of having committed the murders.
While discovering an illegal automotive chop shop, the NCIS team stumbles upon a severed head of a Marine, hidden in one of the cars from the shop. When they find possible suspects, the team will have to find the rest of the body and find the murderer.
The Gallagher clan can't believe it when Carl starts to bring money into the household - but his mini-enterprise involves growing cannabis for the Maguires and the police are quick to bust him. Lip is jealous when Mandy gets a new boyfriend and he later discovers that she was the brains behind Carl's business.