Kharis and Brindelune, two half-sister enemies, members of the same Parisian private detective agency, embark on a road-movie through the Mayenne region of France aboard an antique side-car. One of them has just been fired from the RAID following a blunder, the other, an inveterate blunderer, seems to have badly controlled superpowers. During this picaresque odyssey, often bordering on the burlesque, Kharis and Brindelune will meet Lionel and Arthur, two Solex enthusiasts absorbed in an improbable quest worthy of the Knights of the Round Table, as well as Pauline, an extravagant young woman around whom an unspeakable threat hovers.