The Iron Trial (Magisterium #1)

From the imaginations of #1 bestselling authors Black (The Spiderwick Chonicles) and Clare (the Mortal Instruments trilogy) comes a heart-stopping plunge into the magical unknown. Callum Hunt completes the Iron Trial and enters the Magisterium a place that's both sensational and sinister, with dark ties to his past and a twisty path to his future.