A beautiful woman at the wheel of a luxurious sports car... that's all it takes for Lupin to embark on a new adventure. Under the name Lutz Pindor, Count Pryberg-Artikoffen, of the Berlin Jockey Club, he travels to the splendid estate in the Bavarian Alps where Hélène (the pretty woman with the car) and her husband, Baron von Wiesenberg, have organized a horse-riding club. Lupin's arrival coincides with a macabre discovery: ride manager Hornung has just been murdered.