It's a hot, hot day in Woodcock Pocket. Perfect weather for the swing that Puddle has made beside the pond for his friend Opal. But when they return for a swing and a splash, all that's left is the rope. The tire is GONE! They attach another tire but the very next day, it happens again...and AGAIN! Toot and Puddle have a mystery to solve: The Mystery of the Disappearing Swing.