A military settlement lost in the taiga, where classified research into extraterrestrial life forms was conducted, is being blocked by mysterious space aggressors. Valera Stremnin, a retired officer and now a prisoner, unjustly convicted on charges of destruction of state property, is the only one who finds himself outside the blockade. Through forests overrun by creepy creatures, he will have to make a difficult journey to the Ulus-Taiga hill in order to prevent a terrible catastrophe that came to Earth from deep space...