What if being a librarian was the most dangerous job in the world? Worldsoul, a great city that forms a nexus point between Earth and the many dimensions known as the Liminality, is a place where old stories gather, where forgotten legends come to fade and die - or to flourish and rise again. Until recently, Worldsoul has been governed by the Skein, but they have gone missing and no one knows why. The city is also being attacked with lethal flower-bombs from an unknown enemy. Mercy Fane and her fellow Librarians are doing their best to maintain the Library, but...things...keep breaking out of ancient texts and legends are escaping into the city. Mercy must pursue one such dangerous creature. She turns to Shadow, an alchemist, for aid, but Shadow - inadvertently possessed by an ifrit - has a perilous quest of her own to undertake.