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Cub reporter Jimmy Olsen (Jack Larson) pays a visit to his Aunt Louisa (Sarah Padden) who lives in a lighthouse off the coast of Maine. Upon arrival, Jimmy begins to suspect that something is amiss: Though he's never met Aunt Louise, she sure doesn't live up to her description. And besides, there's a sinister looking "cousin" (Jimmy Ogg) and a very terrified young woman (Allen Roberts) on the premise. It is up to Clark Kent (George Reeves) to figure out that the lighthouse is being used by a gang of smugglers--and it's up to Kent's alter ego Superman to save Jimmy from a watery doom..