It's the height of summer and Harry's feeling the heat. So he scurries off to the frog pond where he hops with Melissa the frog into the garden gnome's little sailing boat. Hauling aboard a lily leaf for a sail, they set off on a voyage across the pond - but the wind catches their sail and soon they're speeding through the bullrushes, over which they're not tall enough to see… Then a grumpy dragonfly appears, warning of trouble ahead and the two friends hold on tight to the mast as their little boat carries them towards a roaring waterfall!