Sapphire is a 1959 British crime drama film directed by Basil Dearden and starring Nigel Patrick, Yvonne Mitchell, Michael Craig, and Paul Massie.^[3] A progressive film for its time,^[4] it focuses on racism in London toward immigrants from the West Indies, and explores the "underlying insecurities and fears of ordinary people" about those of another race.^[5]

Children playing on Hampstead Heath in London come across the body of a young light-skinned woman who has been stabbed to death. Police Superintendent Robert Hazard and his assistant, Inspector Phil Learoyd, follow the lead of the woman's handkerchief, monogrammed with an "S," and discover that her name was Sapphire Robbins, a music student. Her brother, a doctor working in Birmingham, is notified. Her fiance, an architecture student named David Harris, claims to have been in Cambridge at the time of the murder.

An autopsy reveals that Sapphire had been three months pregnant. The police are surprised when Dr. Robbins arrives and they see that he is black. He and his sister were mixed race, but Sapphire was able to "pass" as white. Robbins is professional in his bearing and proud, sceptical that the police will actually try to solve his sister's murder.

Investigating Sapphire's life and acquaintances, the officers find that she frequented nightclubs with black clienteles, leading them to look for another possible boyfriend. Learoyd is quick to jump to racist assumptions about the victim's behaviour, but Hazard is nonjudgemental and sometimes counters his assistant's biased views. Interviews with other possible witnesses or connections to the case reveal a range of racist attitudes in the white population.

When the officers question members of David's family, they learn that Sapphire had revealed her family background to David, and had informed his parents and adult sister Mildred about the pregnancy. David's father had reluctantly agreed to David and Sapphire marrying despite his own racist views and the family's concern about their social standing, as well as the knowledge that David would probably have to forfeit an upcoming scholarship to study in Rome.

Visiting Tulip's Club, a nightclub favoured by affluent young blacks, Hazard and Learoyd learn that Sapphire was resented by some of her contemporaries, but that she often went there with a young man called "Johnnie Fiddle". After a chase, Johnnie is caught and brought in by the police. A knife and a bloody shirt are discovered in his room, but Johnnie claims these were from a fight he had with a certain "Horace Big Cigar". In the meantime, however, David is seen acting suspiciously near the murder scene on Hampstead Heath, and it is discovered that he had returned from Cambridge earlier than he claimed on the day of the murder.

Hoping to prod further revelations from those closest to the murder, Hazard brings Dr. Robbins to the Harris home, prompting angry reactions from the family. The most violent comes from Mildred, who responds with disgust when Robbins picks up one of her daughter's toys. Mildred finally confesses to her hatred of Sapphire and to the murder. With the case wrapped up, Hazard acknowledges the larger social evils underlying the case, telling Learoyd that they "didn't solve anything... We just picked up the pieces."

At the 13th British Academy Film Awards, Sapphire won the award for Best British Film.^[12] For her work on the film, the Mystery Writers of America awarded screenwriter Janet Green the Edgar Award for Best Foreign Film.^[13]

In April 1959, Panther Books published a novelisation of the film written by E.G. Cousins.^[14]