The crime-busters of New Scotland Yard return with a new line-up for this fourth and final series of London Weekend's groundbreaking early-seventies police drama.

Though Kingdom and Ward are replaced by DCS Clay and DS Dexter, the series remains as hard-hitting as ever in its portrayal of CID work in the increasingly violent London of the 1970s. Their cases include the murder of a Borstal boy, the organised hi-jacking of lorries, and a recently released armed robber's relentless quest for revenge. Featuring hard-hitting scripts from P.J. Hammond and contributor Tony Hoare, guest stars include Don Henderson, Michael Elphick, Ray Lonnen and Tony Caunter.