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.

• Artna Films Ltd.
• The Rank Organisation
• Nigel Patrick
• Michael Craig
• Yvonne Mitchell
• Paul Massie
• Bernard Miles
• Olga Lindo
• Earl Cameron
• Gordon Heath