After a mysterious cataclysm, the planet was filled with unprecedented creatures, dangerous anomalies and new diseases. Humanity is on the verge of extinction. The remaining people gather in small settlements, organized in the most inaccessible places. In these harsh realities, the profession of a zoologist has acquired a new meaning. Now these are seasoned mercenaries, studying the weaknesses and habits of outlandish creatures. While fulfilling his next order, zoologist Khrust learns about the possibility of returning the planet to its previous appearance. A weak ray of hope opens up old wounds of the protagonist, and he sets off on a journey where new acquaintances and adventures await him.