From New York Times bestselling and award-winning author Julie Berry comes a middle-grade fantasy adventure full of humor and heart.Be careful what you wish for ...Maeve Merritt chafes at the rigid rules at her London boarding school for "Upright Young Ladies." When punishment forces her to sort through the trash, she finds a sardine tin that houses a foul-tempered djinni with no intention of submitting to a schoolgirl as his master.Soon an orphan boy from the charitable home