| Dustin Hoffman | David Sumner |
| Susan George | Amy Sumner |
| T.P. McKenna | Major John Scott |
| Peter Vaughan | Tom Hedden |
| Del Henney | Charlie Venner |
| Ken Hutchinson | Norman Scutt |
| Colin Welland | Reverend Barney Hood |
| Jim Norton | Chris Cawsey |
| Sally Thomsett | Janice Hedden |
| Donald Webster | Riddaway |
| Len Jones | Bobby Hedden |
| Peter Arne | John Niles |
| David Warner | Henry Niles (uncredited) |
An American mathematician moves to Cornwall to escape violence, then turns his rage on local brutes who raped his wife .
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