Italy is about to take the famous cycling race of 1948, the event is seen by everyone, even by Dante Alighieri and by the Roman Emperor Nero from top of the Paradise. Totò is a mild professor who knows nothing about cycling and bicycles, but to make a good impression with her students is at stake practicing day after day. But Totò proves to be a total failure and so desperate calls the devil. This really comes and offers him a contract: Totò would win all cycling races past champions like Gino Bartali or Fausto Coppi, but in the end he had to give his soul and life after the demon. Totò initially includes only the first part of the contract or to win all the races, but then the demon appears to him a second time to remind him of the price you pay. Totò is desperate and does everything possible to not win the last race, but the legs on the pedals are as haunted and Totò can not stop. Approaching the last race and Totò is on the verge of collapsing morally, but his friends and the lovely Dorina, which Totò was madly in love, you invent a trick so clever as to deceive even the Devil.