Tom Foreman kills a policeman after stealing jewellery worth a fortune. He is caught and incarcerated. Prison psychiatrist Ollie Milton and Tom's wife, Val, enlist the help of ex-con "Cat" Devlin in their plot to locate the hidden jewels.
| Actor | Role |
|---|---|
 Beth MorrisVal Foreman | Val Foreman |
| TTrevor MartinTom Foreman | Tom Foreman |
 Alan DavidOllie Milton | Ollie Milton |
 Michael DeeksCat Devlin | Cat Devlin |
 James HazeldineDave | Dave |
| NNeil DaglishDet. Sgt. Rees | Det. Sgt. Rees |
 Victor WindingDet. Insp. Sayers | Det. Insp. Sayers |
| GGeoffrey ColvillePrison Governor | Prison Governor |
| MMaggie WilkinsonMiss Davis | Miss Davis |
 Gareth ForwoodDr. Crampton | Dr. Crampton |
| DDerek WareO'Brady | O'Brady |
 Tony ScannellConnolly | Connolly |
| EEric FrancisMr. Evans | Mr. Evans |
 Polly HemingwayHelen | Helen |
 Jestyn PhillipsPoliceman | Policeman |
| SStanley PagePolice Doctor | Police Doctor |