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Most kids would do anything to pass the Iron Trial.

Not Callum Hunt. He wants to fail.

All his life, Call has been warned by his father to stay away from magic. If he succeeds at the Iron Trial and is admitted into the Magisterium, he is sure it can only mean bad things for him.

So he tries his best to do his worst - and fails at failing.

Now the Magisterium awaits him. It's a place that's both sensational and sinister, with dark ties to his past and a twisty path to his future.

The Iron Trial is just the beginning, for the biggest test is still to come... From the remarkable imaginations of bestselling authors Holly Black and Cassandra Clare comes a heart-stopping, mind-blowing, pulse-pounding plunge into the magical unknown.

Callum Hunt's summer break isn't 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 aren't heading back to the magical world of the Magisterium in the fall.

It's 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 Aaron and Tamara 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 boy's conflict -- and a whole world's fate.

Magic can save you. Magic can kill you.

It should be a time of celebration. The Enemy of Death is dead; a severed head proof of his downfall. The magical world has no reason to believe otherwise, and Callum, Tamara and Aaron are celebrated as heroes.

But at a party held in their honour, things go horribly, brutally wrong. A fellow student is callously murdered, and it seems Call's worst fears are confirmed: there is a spy in the Magisterium.

No one is safe.

Now, using the powerful magic they've been taught, the trio must risk their lives to track down the killer. But magic is dangerous--in the wrong hands it could bring terrible destruction. And reveal the deadliest secret of all...

Callum Hunt's life has fallen apart.

His friend is gone. The spy has escaped. His secret is out.

He is facing an existence behind bars, banished from the rest of the magical community for what he is - for what he might become.

But a shocking revelation has promised freedom - at a cost. Will he stay strong, and faithful to his friends and teachers? Or take the risk, and destroy everything he's ever loved?

This fourth year at the Magisterium will be unlike anything else that has gone before...

Callum Hunt has been a hero and an outcast, a force of good and a portent of evil. While the doors of the Magisterium have been open to him, he has never felt entirely welcome. If anything, he has felt others' resentment... and fear.

Now, as he begins his final year at the magical school, his place is less certain than ever. With one unique exception, he is estranged from most of his friends. A furtive darkness still hounds him. And the greatest challenge he will ever face is right around the corner.

In this monumental conclusion to the Magisterium series, bestselling authors Holly Black and Cassandra Clare push Callum to the brink of annihilation, showing how magic has the ability to both save and doom, create and destroy.