 Jack WatlingDennis Willows | Dennis Willows |
 Rona AndersonSallie Harbord | Sallie Harbord |
 John HorsleyPeter Hastings | Peter Hastings |
 Russell NapierInspector Simmons | Inspector Simmons |
 Kenneth KentDr. Julian Cole | Dr. Julian Cole |
| MMary JonesFlorence Cole | Florence Cole |
 Alastair HunterSgt. Thorpe | Sgt. Thorpe |
 Joan HicksonMiss Edinger | Miss Edinger |
 John Le MesurierPhinneas Tilliard | Phinneas Tilliard |
 June AshleyMadeline Tilliard | Madeline Tilliard |
| HHélène BurlsMrs. James | Mrs. James |
| CCharles HammondJuror at Inquest (uncredited) | Juror at Inquest (uncredited) |
| EEdward FrenchBit Part (uncredited) | Bit Part (uncredited) |
 Peter GilmoreBit Part (uncredited) | Bit Part (uncredited) |
| AArthur GrossBit Part (uncredited) | Bit Part (uncredited) |
| PPat HaganPolice Officer at Inquest (uncredited) | Police Officer at Inquest (uncredited) |
 Neil HallettPolice Constable Guarding Hastings' Home (uncredited) | Police Constable Guarding Hastings' Home (uncredited) |
| HHumphrey MortonUsher (uncredited) | Usher (uncredited) |
| BBartlett MullinsCoroner (uncredited) | Coroner (uncredited) |
| RRichard NellerJuror at Inquest (uncredited) | Juror at Inquest (uncredited) |
 Dandy NicholsWaitress (uncredited) | Waitress (uncredited) |
| AAlan RobinsonPorter (uncredited) | Porter (uncredited) |
| HHugh StewartPoliceman (uncredited) | Policeman (uncredited) |
| JJohn WilderPolice Officer at Inquest (uncredited) | Police Officer at Inquest (uncredited) |
