In the bustling underwater city of Coral Cove, where mer-kids attend school in sunken shipwrecks and ride seahorse buses, young detective Finley Fin and her sidekick, a clever octopus named Inky, stumble upon a baffling case: the Great Pearl of Tides has vanished from the royal aquarium! As they follow glowing jellyfish clues and decode messages hidden in seashell riddles, they uncover a sneaky plot by a band of mischievous electric eels who want to harness the pearl's power to throw the biggest glow-in-the-dark party ever. With teamwork, quick thinking, and a dash of bubble magic, Finley and Inky must outswim the culprits, restore the pearl, and teach everyone that true fun comes from sharing, not stealing.