Three days before Christmas, in the freezing slums of London's East End, thirteen-year-old Gracie Phipps encounters Minnie Maude Mudway, who is eight, alone, and determined to find her friend Charlie. Charlie is a donkey who belonged to Minnie Maude's Uncle Alf. The day before, someone murdered Uncle Alf and made off with his rag-and-bones cart and the beloved beast who pulled it. Minnie Maud means to rescue Charlie, and Grace decides to help. In the cart were not just the usual bits of worn silver and china but also a dazzling golden box. What its contents may have been no one can say, for it too has vanished.