The first two series of Lynda La Plante's TV crime drama. In series one, newly qualified DC Anna Travis (Kelly Reilly) joins a team on the hunt for a particularly gruesome killer who, over an eight-year period, has murdered six people, mainly prostitutes. But when the latest victim is found, and doesn't fit the usual profile, DC Travis sets out to prove herself, even if that means becoming very personally involved. In the second series, the discovery of the mutilated body of a young woman seems to echo that of the notorious, unsolved Los Angeles 'Black Dahlia' murder of the 1940s. Fearing they have a copycat killer on the loose, Travis and DCI Langton (Ciaran Hinds) try to pre-empt the killer's next moves by using clues from the original murder. The investigation soon faces difficulties, however, when Travis and Langton's working relationship becomes increasingly strained.