Qamarand, the golden City of the Moon on the Silk Road, on the Festival of Lanterns. At midnight every debt in the Great Bazaar passes to the bloated Merchant-Prince Baraz Kahn, unless someone steals the jewelled casket that holds his ledger. Zarif, a grinning rooftop thief who only ever steals for himself, is offered a legendary ruby to do it. A light-footed, swashbuckling heist caper of rooftops, disguises and nerve.