London, May, 1911. The new king, George V, is preparing for his coronation. The suffragettes are campaigning for women to get the vote. The East End seethes with unrest. And 18-year-old Kitty Challoner is looking forward to 'coming out' in London society. But Kitty's secure, sheltered world is about to be torn apart. Lydia Challoner is shot dead while out riding in Hyde Park, and during the ensuing murder investigation Kitty discovers that there was so much she didn't know about her mother.