Luca thought the mystery of the Acorn Compass was over. Then an old map turns up in his grandparents' St. Petersburg bungalow-marked with strange coordinates leading into Tampa Bay. Soon, Luca, Liam, and Olivia follow clues through the city's past, from forgotten railroad tracks and historic homes to the waterfront, where pieces of an earlier St. Petersburg still hide beneath the surface. With the mysterious brass compass guiding them again, the three friends discover that finding what was lost may be easier than understanding why someone wanted it remembered. Because some treasures aren't meant to make you rich. They're meant to make you notice. Beneath the Pier is the second book in the St. Petersburg adventure series, a story about friendship, family, local history, and the mysteries that await anyone curious enough to look a little closer.