Anthony Bonehill planned to outwit a Djinn with his seven accomplices. Six to make their wish, and the seventh to wish the Djinn dead. But the seventh accomplice, Carlos Grossford, double-crossed them and now he can wield whatever tyranny he chooses. Djinnis are dangerous and unpredictable though, and unless you choose very wisely indeed, wishes can be equally perilous.
Necessity Bonehill is a tomboy. Being sent to a boarding school for girls has honed rather than tamed her tendencies. She fears her parents were keen to get rid of her, and therefore feels abandoned. So when Uncle Carlos starts sending her food parcels, she is happy that someone cares. Then one day he sends a stoppered bottle. Ness is perplexed, but surely there can't be any harm in opening an empty bottle? Ness unwittingly launches herself into a dangerous world of flying carpets and exotic lashkars as the powerful Djinn is set free, hell-bent on revenge.