In the world of trail running, Sylvaine Cussot needs no introduction: French champion, international podium finishes, victories in the biggest ultra races... This exceptional athlete has left her mark on her sport. This film takes us with her to tackle the Diagonale des Fous, on Réunion Island: 185 kilometers and 10,500m of elevation gain. For Sylvaine, it's a special race, almost a love story; we follow her fifth participation here. This edition is special for her because this time she runs accompanied by the memory of her father. Every stride, every climb, every descent becomes a tribute.