对侦缉督察约翰·里弗而言,自己脑袋里的声音和他调查的犯罪一样棘手。A hardened, yet psychologically vulnerable, Swedish-born police detective in London struggles to deal with having witnessed the murder of his detective partner. He must come to terms with the loss whilst investigating her murder, helped (and sometimes hindered) by what he calls 'manifests' - the ghosts of both victims and criminals, including the shade of his partner.