"In the canton of Yarrowdale, at the very edge of the Empire's reach, a Treasury officer has disappeared into thin air--vanishing from a room within a heavily guarded tower, its door and windows locked from the inside. To solve the case, the Empire calls on its most brilliant and mercurial detective, the great Ana Dolabra. At her side, as always, is her bemused assistant Dinios Kol. Ana soon discovers that they are investigating not a disappearance but a murder--and one of surpassing cunning, carried out by an opponent who can pass through warded doors like a ghost"-- Provided by publisher.