Mirror Image (Schooled in Magic Book 18)

Years ago, Heart’s Eye was captured by a necromancer. All seemed lost, until Emily killed the necromancer and retook the school. Now, she intends to found a university, a place where magical knowledge and mundane technology are brought together for the benefit of all. But dark secrets lie within the shadowed school and Emily finds herself facing a shadow that has walked beside her from the day she came to the Nameless World. It might bring about the end of everything.
In a school full of mirrors, who knows what they reflect?