Escaping the aunt who wants to adopt only one of them, two orphaned brothers run away from Hamburg to Venice, finding shelter with a gang of street children and their leader, the thirteen-year-old "Thief Lord," while also eluding the detective hired to return them to Germany.
Falsely accused of plotting to overthrow King Claudio, scholarly Mangus the magician, along with his street-smart servant boy, Fabrizio, face deadly consequences unless they can track down the real traitor by the stroke of midnight.