She was someone's daughter . . . In 1930, the killing of a Soho prostitute is hardly a priority for Scotland Yard. But when a second, similar murder comes to light, and then a third, everything changes. Cuthbert and his team find themselves in a nightmarish world of people-trafficking, prostitution and drug use amongst the upper classes. Using all his forensic skills, Cuthbert sets out to solve one of the most baffling cases of his career. One final question remains unanswered until a faded photograph reveals its tragic secret.