Sergey Ratny is an engineer-reenactor from the 25th century Earth. As a result of a shipwreck, he ends up on a planet where the level of technology does not exceed what it was on his home planet at the beginning of the 20th century—though technological development has taken a slightly different direction… The locals preferred steam, not internal combustion engines. Here enormous steamships ply the sea, steam vehicles run across the land, steam tractors work in the fields, and giant airships dominate the sky. However, as once on his home planet, bloody war is raging here too, and Sergey is unwillingly forced to become a participant. He begins building the first heavier-than-air machines in this planet’s history—because only airplanes can stand up to the crushing power of enemy airships. The battle for dominance in the air begins…