A powerful new fantasy series from global bestselling authors Cassandra Clare and Holly Black.
From the imaginations of bestselling authors Holly Black and Cassandra Clare comes a heart-stopping plunge into the magical unknown.

Think you know magic?

Think again.

The Magisterium awaits . . .

Most people would do anything to get into the Magisterium and pass the Iron Trial.

Not Callum Hunt.

Call has been told his whole life that he should never trust a magician. And so he tries his best to do his worst – but fails at failing.

Now he must enter the Magisterium.
It's a place that's both sensational and sinister. And Call realizes it has dark ties to his past and a twisty path to his future.

The Iron Trial is just the beginning. Call’s biggest test is still to come . . .

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 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.