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 Patrick
as Superintendent Robert Hazard
Michael Craig
as Inspector Phil Learoyd
Yvonne Mitchell
as Mildred
Paul Massie
as David Harris
Bernard Miles
as Ted Harris
Olga Lindo
as Mrs. Harris
Earl Cameron
as Dr. Robbins
Gordon Heath
as Paul Slade
Barbara Steele
as Student
Peter Vaughan
as Detective Whitehead (uncredited)
Yvonne Buckingham
as Sapphire Robbins
Jocelyn Britton
as Patsy
