The fortress city of Diraxis has long drifted in the sky at permissible heights. Within the powerful Sound Barrier, people managed to relax, establish an ordinary and completely safe life. They did not remember the death hidden in the thickness of the clouds. Pilots forgot the feeling of fear in front of the face of bloodthirsty sound. Only those who flew behind the barrier knew how short life was. Few wanted to join them, and few were ready to hear the frightening howl of the city siren again. Few were willing to remember what the survival war meant. In one day, the first layer of the barrier was destroyed, hundreds of thousands of people died in one day, and in one day the fate of an ordinary city boy changed. He, obsessed with the desire for revenge, obsessed with the thirst to feel the power of an attack combat airliner, took the path of a military pilot. The road was not easy for him.