Two brothers, having run away from the aunt who plans to adopt the younger one, are sought by a detective hired by their aunt, but they have found shelter with--and protection from--Venice's "Thief Lord." Welcome to the magical world of Venice, Italy, where hidden canals and crumbling rooftops shelter runaways and children with incredible secrets. Huyendo de su tía, que intenta separarlos, Próspero y Bonifacio llegan hasta la maravillosa Venecia....