This morning at Grandpa and Grandma's, there’s lots of fog. Simon and Gaspard have just woken up and they go bug-eyed: they have the impression that they're in a cloud! But while they're having fun in the fog, the children stumble on a cow walking around the yard. Grandma knows it well, it's Roussette, she often gets lost. What they have to do now is take her back to the farm!