Petit Spirou déteste prendre un bain, surtout chez Mamy, maniaque de la propreté. Et voilà qu'à cause d'une fenêtre mal fermée, Petit Spirou se retrouve tout nu dehors ! Comment survivre à ça ? Se cacher dans les buissons ? Voler les vêtements qui sèchent dans la maison d'à côté ? Se déguiser en « Manneken Piss » pour attirer l'attention ?
Little Spirou hates having a bath, especially at Mamy’s house, since she's so obsessed with cleanliness. So, because of a badly closed window, Little Spirou ends up getting stuck outside, totally naked! How will he get out of this one? Should he hide in the bushes? Steal some clothes off the washing line next door? Disguise himself as the ‘Manneken-Pis’ to get some attention? Luckily, Mamy’s neighbor comes and protects his modesty, even if she does force him to take a bath!