Cassandre investigates the death of Xavier Delmont, 33, well known in the region for being the owner of a brand of mountain sports equipment with the wind in its sails: O2Climbers. A brand that sponsors the AlpsMan, an extreme triathlon that will start in a week in Annecy... in which Xavier was to participate! So who was mad at Xavier? A competitor? Cassandre and her team understand that they will have to enter the microcosm of extreme triathlon competition and that surprises await them. Because even if Xavier's company sponsored athletes, they were no less competitors for the AlpsMan...
