The threads of magic

Pip, a pickpocket, picks a terrible target for his next heist, and instead of a jewel he finds he has lifted a small, leathery object of no apparent value--but soon he finds himself being hunted. The object, it turns out, is the Stone Heart, and when he took it, Pip accidentally broke an ancient spell. To fix his mess, Pip must team up with his sister, their friend Oni, Princess Georgette, and the witches of Clarel.