Engineer Maxim Baykov receives from an unknown person an offer to sell the technical documentation of a new Boeing, which he is working on at JSC Zaslon. He refuses and is hit by a car. However, Maxim does not die, but ends up in the future. Here he learns that during the testing of the Boeing there will be an explosion and his colleagues will die. He returns, warns of danger, but they do not believe him. He himself does not understand where the trouble will come from. The test site and its approaches are strictly guarded, everything is under control, and the date of the explosion is approaching. Will he be able to prevent it? And who will help him with this? Sometimes help comes from where you don't expect it.