The first book in the series. It happens: you live in peace, go hiking with friends, keep a blog and write articles for several Internet portals. But suddenly you find out that you have a second life that you didn’t even know about. And in this other life you are not a journalist Kostya Khramtsov, but a Hunter, a hunter of creatures from the Upside Down, one of the few surviving Masters. What to do when two destinies are intertwined, when sometimes it is not clear where is a dream and where is reality? What to do if the friends with whom you went on an ordinary hike turn into monsters? Where do you get the strength to destroy them, because this is your job and your destiny? How do you know who is a friend and who is an enemy? And how to choose, how to understand in which world you are real?* Espejo - mirror (Spanish) The book is written in collaboration with Yegor Goryachev.