Vadka and his sister Katka, young detectives from the White Goose agency, went to a summer physics and mathematics camp. Relax by the sea, swim, solve tricky problems with teachers from the university. Only in reality everything turned out to be not so rosy. Not only is the boarding house not completed, but also the science camp is combined with a military sports camp. It is logical that the mixture of young physics and mathematicians and athletes in camouflage turned out to be explosive. The first consider someone who doesn’t understand programming to be a weakling, the second consider someone who can’t do a hundred push-ups. Well, what could be worse than this? Only the treasure found... because an explosion requires a detonator.