Pseudonymous Bosch crosses with Angie Sage in a middle-grade novel that mixes mystery and fantasy as our intrepid heroine investigates the theft of a ruby necklace that bestows upon its wearer untold powers.

A break-in at the museum, mysterious visitors to the grand new library, and a cute guy that Oona is just beginning to notice provide obstacles, distraction, and aid as Oona navigates her way among the politics of her wizard neighbors to discover who is to blame in the latest Oona Crate mystery.