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Description:  Rudolf Hefting is a fourteen-year-old who volunteers for an experiment with a time machine. The experiment goes well, but he ends up accidentally stranded in the 13th century. He saves the life of Leonardo Fibonacci, without realizing who he is, and together they join the German Children's Crusade, where he aids the children and manages to save most of the children from horrible fates with the aid of his twentieth-century knowledge and a couple of items from the future (such as a box of matches). /// Rudolf "Dolf" Hefting is a fourteen year-old who volunteers for an experiment with a time machine. The experiment goes well, but through an accident Dolf is stranded in the 13th century. He saves the life of Leonardo Fibonacci, without realizing who he is, and teaches him Arabic numerals. Together they join the German Children's Crusade, and through his modern-day knowledge, Rudolph manages to save a lot of children from horrible fates. However, his knowledge also leads to accusations of witchcraft.