Paul and Maureen Beebe's determination to own a pony from the herd on Chincoteague Island, Virginia, is greatly increased when the elusive Phantom and her colt are among the ponies rounded up for the yearly auction.

Willa and Ben must find out who is poisoning the Starlings' new horse, Buttercup, before it is too late.

"A lost pony is cause for a nighttime adventure on Chincoteague Island in this third book of a chapter book series inspired by Marguerite Henry's Misty of Chincoteague. Full Moon Fancy, Fancy for short, is a pony with a knack for getting loose. First she just tramples a herb garden, then she knocks over a wall of a chicken coop, so the hens end up all over the yard and down on the beach. When she gets out one too many times, Willa and Ben are worried...

Planning to make her father's famous raspberry torte for a back-to-school project, Willa is dismayed when her plans are upended by a poor raspberry crop, forcing her to scramble for an alternate idea.

Busily preparing for an annual pony swim event, the Dunlaps learn that a famous travel writer will be attending who could attract valuable tourism to Misty Inn and their island home.

Misty Inn is up and running, and the Dunlaps have a full house. Willa is thrilled that Kate, her best friend from Chicago, is going to come to Chincoteague for a visit. But it's been a whole year since they've seen each other, and Willa soon realizes their friendship is not as easy as it had once been. Adding to the tension is the fact that a Chincoteague friend, Sarah Starling, is away at camp for the week, not to mention the fact that Ben seems...