Accepting an invitation from Mrs. Chantry, Mr. Drew's client, to relax at her cottage in a picturesque seaside town, Nancy finds herself drawn into a twisted mystery. Carson Drew promised to join his daughter, but never arrived. The strange disappearance of Mr. Drew and the even stranger circumstances of his rescue are only the beginning of a series of very dangerous adventures for Nancy and her friends Bess and Georgie. Mrs. Chantry's story about a nearby cave supposedly haunted intrigues Nancy, and the girl goes in search. Several frightened townspeople claim to have seen a ghost and heard strange sounds of a bell ringing just before water began to pour out of the cave. Nancy will again be able to outwit the scammers and get to the bottom of the truth, which will arouse the admiration of all her fans.