"Crusade in Jeans" is one of the most popular Dutch children's books ever. This is the original Dutch book. The book is recently made into an English spoken movie !
Story about 16 year old Dolf Wega. He just screwed up an important soccer match and wants to use the scientific experiment of his mother - a time machine - to go back in time to fix it. Unfortunately he types in the wrong data and arrives in the year 1212. He almost gets mugged by two thieves but he's rescued by Jenne. He joins a children's crusade heading for Jerusalem and with his modern wit and responsibility he becomes the actual leader of the group. But what are the real plans of the people who organized this crusade? And why are they heading for Genoa in Italy instead of Israel?