The Secret of the Old Coin: A Sloane Quinn Mystery

When ten-year-old budding detective Pearl Sloane and eight-year-old Indie Quinn find a strange coin buried in the warm summer sand of a Lake Michigan beach, they initially think they've uncovered the coolest pirate treasure ever. However, when a beachcomber with a metal detector starts acting suspiciously and introduces another shady character claiming ownership, they realize this isn't just any ordinary treasure.

Pearl, with two previously solved cases in her files, believes the coin has an interesting story to tell. Indie, always the whimsical child, claims it came from a sunken pirate ship. Soon, their imaginations clash with real danger as the girls uncover clues linking the coin to a centuries-old mystery.
Armed with curiosity, courage, and a knack for noticing what adults overlook, Pearl and Indie dive into their most thrilling case yet. With assistance from their eleven-year-old cousin Jonah, who joins the duo with theories, jokes, and a few wild guesses, they piece together a puzzle that takes them from sandy beaches to shadowy boardwalks and into the heart of a summer mystery.