About the book: year / The very first expedition to Mars, which recruited specialists from around the world - the first Martian construction battalion. It burrows into the ground at three points on Mars at once. Prepares the ground for the colonization of the planet. By chance, earthlings learn about the existence of a huge city inside Mars - the remnants of the former greatness of the ancient civilization of the Martians. No one even imagined that this civilization was destroyed by the mysterious Globula cloud, which periodically visits Mars. Having penetrated the city and encountered this cloud, earthlings gradually learn the history of Mars and begin to fight for its future. It turned out that the Globula cloud is used by the inhabitants of the rogue planet Planemo to destroy the inhabitants of the city. Earthlings are not ready for an armed conflict on Mars. They have to use improvised weapons. The hero of the novel, Sergei Babura, goes through all the tests and is ready to go to the planet Planemo to unravel its secret and avert the threat of destruction not only from Mars, but also from Earth.