 | Peter Firth als Robert 'Bobby' Stewart |
 | George Sewell als Henry Stewart |
 | Patrick Allen als Insp. Cook |
 | Derek Newark als Mercer |
 | Dudley Sutton als Finch |
 | Barry Jackson als Wheeler |
 | Christopher Malcolm |
 | Edwin Richfield |
 | Richard Wattis |
 | Ambrosine Phillpotts |
 | Allan Cuthbertson |
 | Arthur Hewlett |
 | Spencer Banks |
| Cynthia Lund |
 | Candace Glendenning |
 | Robin Langford |
 | Tom Bowman |
 | John Savident |
| Mark Edwards |
| Patrick McAlinney |
 | Andrew McCulloch |
 | George Woodbridge |
 | Patrick Holt |
| Maggie Hanley |
 | George Innes |
| Jerome Courtland | Director |
| William Robert Yates | Screenplay |
