两名苏格兰场侦探正在调查杀害一名冒充白人的混血年轻女子的凶手。在采访包括女孩的白人男友和他不赞成的父母在内的一系列嫌疑人时，调查人员趟过了根深蒂固的种族主义和偏执的污泥。
Nigel Patrick
Superintendent Robert Hazard
Michael Craig
Inspector Phil Learoyd
Yvonne Mitchell
Mildred
Paul Massie
David Harris
Bernard Miles
Ted Harris
Olga Lindo
Mrs. Harris
Earl Cameron
Dr. Robbins
Gordon Heath
Paul Slade
Barbara Steele
Student
Peter Vaughan
Detective Whitehead (uncredited)
Yvonne Buckingham
Sapphire Robbins
Jocelyn Britton
Patsy
Robert Adams
Horace Big Cigar
Desmond Llewelyn
Police Constable
