After a written invitation from his aunt whom he hasn't seen in many years, Jimmy goes to an island off the coast of Maine to visit her and his cousin, Chris, and a mute housekeeper, but when he arrives they are less than thrilled to see him. Even they are supposedly the only ones on the island Jimmy hears an unknown female cry for help, and encounters a man who mistakes him for Chris, and sees the light on in the supposedly abandoned lighthouse. Frightened, Jimmy calls the Daily Planet for help and Clark/Superman flies to the island to investigate. From there, they investigate a number of strange occurences on the island, including the mystery behind the lighthouse and the secret of the strange voice Jimmy has been hearing. It's a vacation Jimy is sure to never forget!