Victor Sereda, the school authority in all matters relating to the exact sciences, tells about his project of the flight to the constellation of Cassiopeia on a spacecraft "The Dawn." Actually, nothing would have happened if a mysterious person who presented himself as P.S.D., which means performing special duties, didn't suddenly appear. As it turned out, there is completing a team of children under 14 years for a space flight. Why the children's age must be under 14? Because the flight there and back will take more than fifty years for children, and on the Earth the century will pass. And everything would proceed according to the plan, if the seventh member didn't appear on the ship - a bully Fyodor Lobanov, creator of superglue, smuggled himself into the ship.