Camille and Antoine, two French slackliners and mountaineers, have a dream: to walk on a 480 meter highline between the mythical Aiguilles d’Arves at an altitude of 3,500 meters. Arves-En-Ciel tells the story of an astonishing project, which required the sustained involvement of a team fully invested in this project that aroused the skepticism of the local mountain people.