The third, powerful instalment in the "Magisterium" sequence. The mysteries of the magic school like no other deepen and widen, as bestselling authors Holly Black and Cassandra Clare take readers on an extraordinary journey through one boy's conflict and a whole world's fate.

Holly Black is the bestselling author of contemporary fantasy novels for teens and children, including Tithe: A Modern Faerie Tale and the #1 New York Times bestselling Spiderwick series. She has been a finalist for the Mythopoeic Award and the Eisner Award, and the recipient of the Andre Norton Award. Holly lives in Massachusetts with her husband, Theo, in a house with a secret library. Her website is www.blackholly.com.