| Jack Hawkins | Insp. George Gideon |
| Dianne Foster | Joanna Delafield |
| Cyril Cusack | Herbert 'Birdie' Sparrow |
| Anna Lee | Mrs. Kate Gideon |
| Anna Massey | Sally Gideon |
| Andrew Ray | PC Simon Farnaby-Green |
| James Hayter | Robert Mason |
| Ronald Howard | Paul Delafield |
| Howard Marion-Crawford | Chief of Scotland Yard |
| Laurence Naismith | Arthur Sayer |
| Derek Bond | Det. Sgt. Eric Kirby |
| Griselda Harvey | Mrs. Kirby |
| Frank Lawton | Det. Sgt. Frank Liggott |
| John Loder | Ponsford (the Duke) |
| Marjorie Rhodes | Mrs. Rosie Saparelli |
| Hermione Bell | Dolly Saparelli (uncredited) |
| Michael Trubshawe | Sgt. Golly |
| Jack Watling | Rev. Julian Small |
| Henry Longhurst | The Vicar (uncredited) |
| Michael Shepley | Sir Rupert Bellamy |
| Nigel Fitzgerald | Insp. Cameron (uncredited) |
| Robert Raglan | Dawson (uncredited) |
| Maureen Potter | Ethel Sparrow (uncredited) |
| Doreen Madden | Miss Courtney |
| Miles Malleson | Judge at Old Bailey |
The chief inspector at Scotland Yard deals with a hit-and-run killing, a murder and robbers.
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