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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 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.