In a timeless story, 16-year-old Marigold "Goldie" Vance lives at a Florida resort with her dad, who manages the place. Her mom, who divorced her dad years ago, works as a live mermaid at a club downtown. Goldie has an insatiable curiosity, which explains her dream to one day become the hotel's in-house detective. When Charles, the current detective, encounters a case he can't crack, he agrees to mentor Goldie in exchange for her help solving the mystery utilizing her smarts, random skills, and connections with the hotel staff and various folks in town.