Nick and Sally are excited to jump in the giant puddle in their backyard—but it's gone! Where did it go? With the help of the Cat's camera, they see that the puddle has turned into water vapor. Off they go into the Bluey Blue Sky to follow the water that was in their puddle. They discover that water vapor rises into the sky, then cools off, and falls as rain. When they return home, they are delighted to see that their puddle is back
