The discovery of the murdered girl sets "Supt. Hazard," portrayed by Nigel Patrick, and his colleague "Learoyd" (Michael Craig) on a path to uncover the truth. Initial reactions from her friends, landlady, and fiancé “David” (Paul Massie), along with his family, appear genuinely distressed; however, the investigation shifts considerably upon the arrival of her brother, who is a doctor. What follows is an uncomplicated police procedural, though it highlights the social and racial dynamics present in London during the late 1950s—a moving and disheartening portrayal of how prejudice was tolerated across different social groups, even among those involved in solving the crime. Patrick delivers a dependable performance, as does Bernard Miles ("Ted"), who plays the victim’s prospective father-in-law. While the ending shares some similarities with Agatha Christie's work, it remains an engaging and unsettling experience overall.

Source on TMDB