Book 4 in the series, "The Mystery at Caspersen Beach," takes young readers on an unforgettable journey with sisters Regina and Margo. Every summer, the sisters look forward to their adventure at their grandparents' cozy beach house in Sarasota. This year, with Nala, the quick and witty calico cat, they're on a mission to solve a mystery that leads them from the sandy stretches of Caspersen Beach through the whispering mangroves, armed with a map and a megalodon shark's tooth from their past adventures.
Their path is intertwined with friendly sea creatures, including a jolly shark who's misplaced his tooth, playful dolphins, and hidden treasures of the beach. Together, they solve puzzles only the bravest adventurers can, leading to a discovery that paves the way for future summer adventures.