Collision. Arena of the Lost

The first book of a new trilogy by Marina Yasinskaya, author of the captivating cycle «Avioneers».
Kristina was sure that there was nothing worse than living in a small dreary town, going to a hated school, and only dreaming of escaping to the big adult world. After all, even circus artists have a more interesting life!
Oh yes, much more interesting… To survive, one must burn in the fire and not get burned. Or fearlessly look into the eyes of a jaguar. Or dodge wild hounds.
Kristina would be glad to return to her familiar world, but… Who is that in the window of her native apartment, next to her parents and brother? The second Kristina?