Sally Lockhart's friend and partner-in-adventure Jim Taylor has just solved a mystery. For years he's been searching for Adelaide, the little girl enslaved by toothless crone Mrs Holland in The Ruby in the Smoke. And now he's found her - just as she's about to become a princess. Crown Princess of Razkavia, to be exact, and a princess in danger. Her future husband is desperate to protect his bride, and employs Jim as their bodyguard - Razkavia's quaint little streets are full of danger...