It is spring and Running River is in full flood. Tiptoes Lightly and Jeremy Mouse visit Greenleaf the Sailor and they venture forth in Greenleaf's newly made boat. Soon they are joined by Pine Cone and Pepper Pot the Gnomes and together they search for the Lost Lagoon the frogs have been so beautifully singing about. Meanwhile, back home, Farmer John reads The Adam Tales to Tom Nutcracker and June Berry. Later, Tom rides off in the night until he too comes to the Lost Lagoon. What happens on this night, with its majestic, rising moon, is filled with a wonder and magic that won't soon be forgotten.