When WPC Jane Tennison is promoted to the role of Detective Constable in London's Bow Street CID, she is immediately conflicted. While her more experienced colleagues move on swiftly from one criminal case to another, Jane is often left doubting their methods and findings. As she becomes inextricably involved in a multiple rape case, Jane must put her life at risk in her search for answers.

Will she toe the line, or endanger her position by seeking the truth?