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!