Life for Henrietta Jenkins was a quiet, well-ordered affair—a home with her widowed mother and degree studies at university. But her life changed dramatically when, just before her 21st birthday, her mother's body was found in a quiet road, apparently the victim of a hit-and-run driver. For not only did the simple case turn into a murder hunt, but the post mortem also revealed that Grace Jenkins had never had any children. In which case, who was Henrietta?