British director Basil Dearden steps forth with another progressive movie centered around London and prejudices. This time it’s deep racial tensions rife through-out the city. It starts with the gruesome find of a young girls body on Hampstead Heath. In comes Superintendent Robert Hazard (Nigel Patrick) and his right hand man Inspector Phil Learoyd (Michael Craig) hot on the case. Following their early investigations they discover that the murder victim was a young feisty girl called Sapphire Robbins (Yvonne Buckingham). This leads them to her college boyfriend David Harris (Paul Massie) and he quickly becomes prime suspect in the case.