All the years spent behind the school bench, they were devoted to the dream of flying. And now they are again students, but they are solving completely different problems. Three young daredevils conquer the sky, forgetting about earthly problems and disputes. But the everyday life of test pilots of supersonic fighters is unpredictable and dangerous. A routine training flight overnight can be a harsh test of courage for them. Today, future aces will face a difficult exam, for which life itself will put a mark.