When MacGregor finds something squishy in his rainboot, he never expects it to led to a magical underwater adventure! Alongside his curious cat Gurdy and a baby tadpole names Ripple, MacGregor plunges into a stormy pond world. The Croakstone, a magical item in the center of Hopper's Hollow Frog Club, must be located. To find it, MacGregor must help Ripple and his siblings navigate their way through the stormy waters as they transition through the life cycle of a frog. Will they reach the Frogs Only Club in time? Or will the storm carry the Croakstone and all its magical secrets away forever? A whimsical science adventure about growing up, helping other, and discovering the magic of change one lead at a time.