A detective chief inspector from 2006 is investigating a serial killer when he is knocked over by a speeding car. Waking up, he finds himself mysteriously transported back in time to 1973. Initially struggling to come to terms with his situation, he has to come to terms with the old-fashioned technology and attitude of the day, while figuring out how he came to be trapped in the past. The actor John Simm described the show as "a cross between Back to the Future and The Sweeney", and it makes effective use of the disorientation of the unwitting time traveller while taking a post-modern romp through 1970s fashions and technologies, with due tribute paid to the classic police dramas of the day to fashion a truly unique programme.