Plot synopsis: Jessie and Clara Solenza are two sisters who have always been immersed in the world of motorcycle racing. Today, they have taken over their father's garage, known throughout Europe and whose reputation is well established ... To such an extent that takeover offers are multiplying, especially from the family of the great champion Eric Serrati, Jessie's late fiance. They are determined to use tricks more vicious than the others to achieve their ends. But information on the death of young Serrati will change the situation ... Will the two clans end up being reconciled?