The adventures of the beloved young readers of the inseparable six friends from Croix-Russ and their faithful dog Cafi continue! The company decides to spend the holidays in Spain . But at the border there are a number of incidents that changed their plans. The mysterious object of unknown purpose found by the guys becomes the beginning of a complex investigation, which leads to the most unexpected results... Who would have thought that an ordinary ball that knocked out the glass of an abandoned basement could bring such terrible troubles on its owner! It is good that six friends from Croix-Russ are always ready to come to the rescue of someone who needs it. It turns out that in the old basement there is some mysterious life, the course of which was broken. The publication includes two novels - "The mystery of the man in the glove" and "The mystery of the "flying" brigade" .