Summer holidays. 11-year old Jonas expects lots of fun and action. But his family, scattered between Slovakia and Germany, haven’t really spoken to each other since his father died. So mother Beate has prescribed a healthy sea climate at Aunt Anne’s instead of going to Slovakia as they used to do. Jonas is stunned. He promptly packs his bags and sets off, on his own, to visit his cool grandpa Bernard in Slovakia. When he arrives, everything seems to be the same as ever, only grandpa has changed. Without a wife or job, the old railway worker is not in the best of moods. Jonas knows that something must be done, and it’s all up to him to do it! He teams up with Alex, who becomes his best friend, and together they develop a series of criminally good ideas. The consequences are soon felt.