Teenager Carrie comes home from a party one night to discover her mother, a prostitute named Sally, murdered. Although she sees a blood-stained man at the scene, the crime goes unsolved.

DI Hain opens up to Carol about his complicated history with the case: he was ultimately removed from the original investigation because he had been a client of Sally’s. Before that happened, however, he looked into the massage parlor where Sally was employed and came across information that cast suspicion on a fellow police officer.

Carol goes undercover at the massage parlor where her mother worked and discovers evidence of a child-pornography operation. As she tries to identify the ringleaders, she hopes to solve the mystery of her mother's murder at last.