The Bill: The Screw (Part 1)

Part one of two. Jo Masters goes undercover as a warder at Stonewall prison to investigate the source of drugs which have led to a spate of overdoses. Yvonne Hemmingway comes across an old flame involved in a shooting case and is forced to arrest him for concealing vital evidence, while Dan Casper's affair with commander's wife Rochelle Barratt is strained when they clash over a professional matter. Pauline Quirke guest stars