His name was Frank Pérák and people knew him as a mysterious figure with jumping springs on his feet. The fictional hero was raging in the occupied Czech Lands during World War II, jumping even over high tenements and also across the Vltava River valley. According to legend he fought the German occupiers and collaborators, sabotaging their war economy. No one really knows who Frank Pérák was, except Petr Stančík, who has dedicated a whole novel to this superhero resisting the Nazis. The read offers a combination of thrilling narration, lessons in history and precisely measured doses of humor.