On a beautiful morning in mid-May, the body of a young woman is found in one of Notting Hill's private gardens. To passersby the pretty girl in the white dress looks as if she's sleeping. But Reagan Keating has been murdered, and the lead detective, DI Kerry Boatman, turns to Gemma James for help. She and Gemma worked together on a previous investigation, and Gemma has a personal connection to the case: Reagan was the nanny of a child who attends the same dance studio as Toby, Gemma's son. Gemma soon discovers that Reagan's death is the second tragedy in this exclusive London park; a few months before, a young boy died in a tragic accident. But when still another of the garden residents meets a violent end, it becomes clear that there are more sinister forces at play. Boatman and Gemma must stop the killer before another innocent life is taken.