Welcome to the most magical house in London, Oz and Lily's family have inherited it together with the mysterious shop downstairs. Long ago, its famous chocolate-makers were clever sorcerers. Now evil villains are hunting the secret of their greatest recipe. The terrifying power of this magic chocolate could destroy the world. The children are swept into a thrilling battle, helped by an invisible cat, a talking rat and the ghost of an elephant. Suggested level: primary.