The cunning Dalatians really like the useless planet Earth, lost on the border of habitable space. An insidious plan is born - how to “free” her from aggressive and gullible earthlings. Smiling and rubbing his hands in anticipation of victory, Third Level Controller Genrikh Genrikhovich Stern, better known in distant Dalat as Lein La Haar...But Captain Alexander Troshin leads his fighting squad into the Arena. They have almost no chance of success. However, the future of the Earth is at stake. And all that remains is to prove—to ourselves and everyone else—that “almost” does not count not only on Earth, but also in Space.