“Oh, how tired you get from all this work! - sigh the young detective Romka and his sister Leshka. “But now that’s it: during these holidays we’ll relax like normal people, without investigations, flying saucers and dancing statues.” And maybe this would have happened if someone else had been traveling in the same compartment with the guys. But the brother and sister got the creator of the miracle cure as a traveling companion, and that’s where it all began. In the middle of the night an uninvited guest appears in the compartment, and then, when a deafening explosion occurs...