The Bronze Key by Cassandra Clare
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"The Bronze Key" throws another wrench into Callum Hunt's already complicated life. Now a respected student at the Magisterium, things seem to be going well until a student is murdered—and Call might be next. As he, Aaron, and Tamara dig deeper, they uncover a conspiracy that could change the Magisterium forever.
Suffice it to say, the story handles the dark and the light, with everything from friendship pacts to assassination plots. An engrossing read for the SFcrowsnest devotee who understands that even in a magical school, danger can lurk around any enchanted corner.