The earth has not known war for a long time, but romantic young men still go to enroll in airborne schools. And if a race of aliens sets their sights on their home planet, they will cover it on distant frontiers. The interstellar war swirled paratrooper cadet Denis Demin in its whirlpool, and in a matter of months, the young man drafted into the fleet became the commander of a tactical ship. Battles with the enemy in space and on the surface of planets follow one after another... Demin has always been unlucky in love. Will he be lucky in a fierce battle with superior enemy forces, in which the stake is the existence of the Earth?