Twelve-year-old orphan Roo Fanshaw is sent to live with an uncle she never knew in a largely uninhabited mansion on Cough Rock Island and discovers a wild river boy, an invalid cousin, and the mysteries of a hidden garden.

Hugo, a young sasquatch, and his friend Gigi use a Monster Detector to find a Green Whistler, but when Hugo's human friend, Boone, joins in, surprises are in store.

On an island off the coast of Maine, where children ride lobster boats to school, Piper worries that too much good luck can sometimes equal bad luck.

On an island off the coast of Maine, where children ride lobster boats to school, Piper wants a horse but finds, instead, another object hidden in the red maple tree.