Aboard a specially decorated motorhome made by Lulu, they will travel the roads of France for the first time, following "an itinerary as twisted as Lucie's spine" (sic). From the French Riviera to Mont-Saint-Michel, via the Arcachon basin, Hauts-de-France and Lot, before reaching the Champs-Elysées for a finish as prestigious as the Tour de France. On the agenda: a reunion with a fourth-grade class, funny gypsies, a haunted castle, oysters and white wine with the most famous oyster farmer, but also a few activities strongly discouraged for people with muscular dystrophy... and above all, big-hearted French people, as funny as they are generous, who offer us the best of their country through their hospitality.

The renowned psychiatrist Lilian Steiner mounts a private investigation into the death of one of her patients, whom she is convinced has been murdered.