Theories about whys and wherefores of an attractive young woman found murdered and dumped in a London park get turned upside down when the victim's brother arrives in town to be interviewed by police. The brother is black but the cops are investigating the murder of a white woman or so they thought. Race relations play a pivotal role in this saga but not gratuitously to the detriment of an excellent script, cast and production. Indeed the interactions between cops, blacks and whites provide a matter-of-fact look at attitudes and prejudices on the cusp of the 1960's in a rather mature manner. It's not a subject to dance around. Together with Nigel Patrick's portrayal of the consummate Chief Inspector, Sapphire makes for absorbing drama.