For eight years, someone has been murdering women, following the same brutal ritual each time. The most recent victim doesn't fit the profile, but evidence links her to the others. Anna volunteers to go undercover to crack the case.

Langton allows Anna to spend an evening at the ballet with the prime suspect, a handsome actor on the brink of stardom. A discovery at the place where one of the victims lived helps Anna set a trap. Meanwhile, sparks fly between Anna and Langton.

A young woman's body is found by the Thames, horribly mutilated and drained of blood. It's exactly like the famously unsolved Black Dahlia murder that happened in Los Angeles-in 1947. When Anna's senior officer, DCI Morgan, falls ill, Langton steps in.

After a second victim is discovered, Anna gets too close to a journalist that the copycat killer has involved in the case. When an angry Langton suspends her, Anna has her own reasons to regret the attachment. A suspect is identified, but he seems to have an alibi.

An anonymous tip leads Anna and Langton to a deeply troubled family with long-buried secrets, a vain and arrogant father, and a fiercely protective housekeeper. When the murderer is cornered, the case takes a shocking final turn.

Former detective shot to death was found in a drug house. Neighbors heard three gunshots, but only two were collected. Travis obtains a list of vehicles that entered and exited the apartment that night, and finds a big-time drug dealer among the drug addicts that surfaced. Meanwhile, forensics also seizes a deleterious drug from the crime scene.