Season 4

01 Spit and Polish Episode 113th September 1972 02 Killer Episode 220th September 1972 03 Surveillance Episode 327th September 1972 04 Dog Eat Dog Episode 44th October 1972 05 Bank Rate Episode 511th October 1972 06 On the Third Day Episode 618th October 1972 07 The Witness Episode 725th October 1972 08 Run for your Money Episode 81st November 1972 09 New Broom Episode 98th November 1972 10 Paper Chase Episode 1015th November 1972 A search is on for a couple who are flooding shops with fake one pound notes. Market stallholder Ben Fisher attempts to get his money back by using local dog track. 11 Welcome to the Club Episode 1122nd November 1972 12 Justice Episode 1229th November 1972 13 Conversion Episode 136th December 1972 14 Needle Episode 1413th December 1972 An unpopular prison warden is run down outside the prison gates. Watt believes he knows which prisoner was behind it but he has to find the driver. 15 Execution Episode 1520th December 1972 16 Time-Table Episode 163rd January 1973 17 Conspiracy Episode 1710th January 1973 18 Money for Sale Episode 1817th January 1973 19 For Love or Money Episode 1924th January 1973 20 Little Acorns Episode 2031st January 1973