While vacationing in a seaside town, Nancy learns her father has been kidnapped.
She and Ned rescue Carson Drew and help him investigate a cosmetic company and its inferior merchandise.
Meanwhile, the girl sleuth is captivated by another mystery.
Stories about the eerie moans from a cave carved in the jagged wall of the bluff compel her to explore.
Several frightened townspeople claim to have seen a ghost, accompanied by the mournful sound of a tolling bell just before water rushes from the cave.
During her searches, Nancy discovers the true cause and reasons behind these mysterious occurrences!