About the book: 2020 / Sergeant Petrov was part of a sabotage group that, using ancient technologies, was supposed to destroy an important stronghold of alien invaders. But he had no idea that the mysterious device that the saboteurs used to move in space could also work as a time machine. Gladiator Quint apparently died in the arena, since there are no demons in the normal world. But is it worth being afraid of demons if you're already dead anyway??