Book excerpt: When your classmate, Louisa, arrives at school in tears, you hope there’s a way to make her smile again. Someone stole a pendant worn by her great-grandmother, and the clues are utterly baffling: a damaged chain, an out of place sock, and no sign of the pendant anywhere. But with you and Pippa on the case, Louisa has high hopes. Do you think you can find her family’s missing jewel? See if you can solve the mystery before Pippa does!