Sorcery of thorns (Broché)

All sorcerers are evil. Elisabeth has known that as long as she has known anything. Raised as a foundling in one of Austermeer's Great Libraries, Elisabeth has grown up among magical grimoires that rattle beneath iron chains, capable of transforming into grotesque monsters. When an act of sabotage releases the library's most dangerous grimoire, Elisabeth is accused of treason. With no one to turn to but her sworn enemy, the sorcerer Nathaniel Thorn, and his mysterious servant, she finds herself entangled in a centuries-old conspiracy.
Not only could the Great Libraries go up in flames, but the world along with them.