The Red Necklace - Sally Gardner

A mysterious gypsy boy, Yann Margoza, and his guardian, a dwarf, work for the magician Topolain in 1789. On the night of Topolain's death, Yann's life truly begins. That's when he meets Sido, an heiress with a horrible father. An attachment is born that will determine both their paths. Revolution is afoot in France, and Sido is being used as a pawn. Only Yann will dare to rescue her from a fearful villain named Count Kalliovski. It will take all of Yann's newly discovered talent to unravel the mysteries of Sido's past and his own and to fight the devilish count.