Two Scotland Yard detectives investigate the murder of a young woman of mixed race who had been passing for white. As they interview a spate of suspects -- including the girl's white boyfriend and his disapproving parents -- the detectives wade through a stubbornly entrenched sludge of racism and bigotry.

Nigel Patrickas Superintendent Robert Hazard
Michael Craigas Inspector Phil Learoyd
Yvonne Mitchellas Mildred
Paul Massieas David Harris
Bernard Milesas Ted Harris
Olga Lindoas Mrs. Harris
Earl Cameronas Dr. Robbins
Gordon Heathas Paul Slade
Barbara Steeleas Student (uncredited)
Peter Vaughanas Detective Whitehead (uncredited)