In the magical city of Venice, two orphaned brothers, Prosper and Bo, run away from their cruel aunt. They join a mysterious gang of child thieves led by a boy called the 'Thief Lord'. The children live in an abandoned movie theater and survive by stealing, all while trying to avoid a detective and searching for a magical merry-go-round that can change a person's age. It's a thrilling adventure about friendship, family, and the power of childhood dreams.