In this follow-up to Thurston T. Turtle Moves to Hubbleville, our endearing newcomer is settling in when he notices everyone's homemade butter cookies and lemonade taste the same. However, stories of the recipes' origins are quite different. While Mr. Turtle's second grade class uncovers other similarities, it is the discovery of old letters, help from the scattered Mr. Possum and a visit to an old family friend that converge to reveal the legend of the lemonade. And the butter cookies, too, of course!