Joseph is a shy, introverted little boy who collects snails. One day, he is swallowed by his belly button and discovers a disturbing world, that of the belly buttonists: these people, by communicating only with their belly buttons, curl up into themselves and turn into snails...
On the eve of summer vacation, Prune leaves her parents for the traditional "end-of-year school trip." But once she's gone, an incredible snowstorm hits the small town where her family lives. Philémon, her younger brother, then makes an astonishing discovery: an Inuit family has settled on a roundabout. The meeting of these two worlds sets the stage for a wonderful adventure.
