Jane Tennison soon starts to learn the cold facts of police work. She turns the head of her boss, DI Bradfield, but also impresses him with her instincts. He enlists her help, and she becomes immersed in her first murder investigation.
Tennison and Bradfield continue their work on the murder case of a young girl, but a breach of police protocol complicates matters. Meanwhile, the Bentley family continues their plans to pull off their biggest crime yet.
Jane is faced with several harsh realities in both her professional and personal life. The investigations around the murder of Julie Ann Collins and the robbery plan of the Bentley family come to a head.