Three days before Christmas, in the freezing slums of London's East End, thirteen-year-old Gracie Phipps and eight-year-old Minnie Maude Mudway join together in a search for Charlie, the donkey who belonged to Minnie Maude's Uncle Alf. Gracie is shocked to learn that only the day before, someone brutally murdered Uncle Alf and made off with his rag-and-bones cart and the beloved beast who pulled it.