Two rival gangs are trying to fix horse races and a jockey is attacked and left for dead in a stage-managed car crash. An insurance investigator makes routine enquiries into the "accident" and one of the gang leaders feels threatened by this and takes counter measures.

Jack Hedley
as Jim Mathews

Jacqueline Ellis
as Marion Parker

Patrick Magee
as Ben Black

Richard Warner
as Mr. Crabtree

Larry Martyn
as Clive Parker

Derek Francis
as R. R. Harris

Austin Trevor
as Col. Warburton

Harry Locke
as Mr. Burnside

George Tovey
as Wally Sanders

Hilda Barry
as Mrs. Sanders