Secrets of the Last Merfolk

In a small coastal town, Finn is enduring a winter vacation with his annoying new stepmother, wishing things could go back to how they were, while Sage is enjoying her new home, wishing things would stay as they are. Then, both children begin to hear an eerie song late at night, luring them to investigate the waters of the town. When they find the magical merfolk, their amazement doesn't last for long, as they need to learn how to put aside their own problems and help the merfolk before the last of their kind are lost forever.