The body of an escort is discovered during the bachelor part of Will Brady, the police commissioner's son. Due to the high-profile guest list (which includes some secret service agents), the host moves the body to the pool, but the detectives soon discover the girl was poisoned not drowned. The investigation reveals a turf war between two different escort companies, which is quickly becoming deadly. Cassidy, working undercover with one of the escort services, leads Benson to Delia Wilson, a New York madame with a long list of influential clients. After a former governor dies from a similar poison, the detectives get enough evidence to charge Wilson with running an escort service. However, she is quickly bailed out, and one of her rival's escorts, Carissa, comes to Amaro scared for her life. Cragen discovers Carissa's body in his bed in the episode's cliffhanger ending.