Walks on the roofs

Agate Mortimer is sixteen, and more than anything she loves to read in a quiet corner or chat with her grandmother - the only close person.
But once a new teacher comes to the Agatha school, and a calm life suddenly flies somersault.
completely devoid of the magical abilities of Agatha falls under the unexpected close attention of the magazine magicians and special services.
And the teacher Igor Keldysh, who is disliked from the first meeting, is the one who is always there.
Or is he just using it too?
What to do if you do not know who the enemy is and who is a friend?
If the past, familiar from textbooks, suddenly became your own reality?
And now it is not known who you are the victim of the experiment, a walking bomb or a living person with his desires, plans and first love?