 Jack WarnerDet. Insp. Fred Fellows | Det. Insp. Fred Fellows |
 Yolande DonlanJean Sherman | Jean Sherman |
 Michael GoodliffeClyde Burchard | Clyde Burchard |
 John Le MesurierMr Simpson | Mr Simpson |
 John BarronRay Tenby | Ray Tenby |
 Moira RedmondJoan Simpson | Joan Simpson |
| CChristine BoccaMrs Simpson | Mrs Simpson |
 Brian OultonRestlin | Restlin |
 Ray BarrettSgt Gorman | Sgt Gorman |
| NNorman ChappellAndy Roach | Andy Roach |
 Joan NewellMrs Banks | Mrs Banks |
 Ronald LewisDet. Sgt. Jim Wilks | Det. Sgt. Jim Wilks |
| PPeter AshmoreMr. Bunnell (uncredited) | Mr. Bunnell (uncredited) |
 Timothy BatesonPorter (uncredited) | Porter (uncredited) |
 Geoffrey BayldonConstable at Murder Scene (uncredited) | Constable at Murder Scene (uncredited) |
| BBasil BealePolice Clerk (uncredited) | Police Clerk (uncredited) |
 Gerald CampionGlazier (uncredited) | Glazier (uncredited) |
 Reginald MarshHilders (uncredited) | Hilders (uncredited) |
| FFred FerrisInformation Sergeant (uncredited) | Information Sergeant (uncredited) |
 John HorsleySupt. Ramsey (uncredited) | Supt. Ramsey (uncredited) |
 Clifford Earl2nd Press Man (uncredited) | 2nd Press Man (uncredited) |
 Charles HoustonGarage Foreman (uncredited) | Garage Foreman (uncredited) |
| JJulie SamuelLois (uncredited) | Lois (uncredited) |
 Robert RaglanChief Constable (uncredited) | Chief Constable (uncredited) |
| GGraham Skidmore1st Press Man (uncredited) | 1st Press Man (uncredited) |
 Kevin StoneyMr. Gardner (uncredited) | Mr. Gardner (uncredited) |
| CCharles LambMr. Peck (uncredited) | Mr. Peck (uncredited) |
 Marianne StoneSecretary (uncredited) | Secretary (uncredited) |
| GGeoffrey RussellChief Superintendent (uncredited) | Chief Superintendent (uncredited) |
 Mike MoyerDriver PC Harris (uncredited) | Driver PC Harris (uncredited) |
