Callum Hunts summer break isnt like other kids. His closest companion is a Chaos-ridden wolf, Havoc. His father suspects him of being secretly evil. And, of course, most kids arent heading back to school in the magical world of the Magisterium . . .

Its not easy for Call . . . and it gets even harder after he checks out his basement and discovers that his dad might be trying to destroy both him and Havoc.

Call escapes to the Magisterium but things only intensify there. The Alkahest - a copper gauntlet capable of separating certain magicians from their magic - has been stolen. And in their search to discover the culprit, Call and his friends awaken the attention of some very dangerous foes - and get closer to an even more dangerous truth.

As the mysteries of the Magisterium deepen and widen, bestselling authors Holly Black and Cassandra Clare take readers on an extraordinary journey through one boys conflict -and a whole worlds fate.

Cassandra Clare (Author) Cassandra Clare is the author of the #1 New York Times, USA TODAY, Wall Street Journal, and Publishers Weekly bestselling Mortal Instruments series, The Infernal Devices trilogy, and The Bane Chronicles. Her books have more than 30 million copies in print worldwide and have been translated into more than thirty-five languages. Cassandra lives in western Massachusetts. Visit her at CassandraClare.com. Learn more about the world of the Shadowhunters at Shadowhunters.com.

Holly Black (Author) 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 iswww.blackholly.com.