Swimming in the tidal pool, Kate peers through her mask at the undersea world below. She grabs Luke’s arm and points to a structure of rocks adorned with seaweed, shells, and starfish—it looks like an underwater fairy castle! Exploring the Isles of Shoals, the two friends discover the magic along these rocky shores. A secret world of adventure awaits - where pirates, ghosts, and a feisty seal are just the beginning! This story is the second exciting mystery chapter book for middle-grade readers in The Fairy Houses Mystery Series