A solid sober account of the theories surrounding identity of Jack the Ripper as of 1973. Barlow and Watt of TV's Z Cars go on a 'busman's holiday' examining the surviving police files on the infamous murder case in an attempt to identify the elusive killer. Witness statements are re-enacted and there is effective use of East End locations. The cast give understated performances, in keeping with the forensic examination of the evidence. This production is a great deal more exciting, not to say, educational, than any of the big budget flatulent Hollywood efforts of recent years and desperately needs to be released on DVD.