By Franklin W. Dixon
Once more Frank and Joe Hardy tackle a complicated case whilst their well-known detective father asks the men to aid him in monitoring down a infamous jewel thief and his accomplices. the path ends up in the outskirts of the Hardys’ domestic city and to a weirdly guarded mansion at the previous Perth property. With their good friend Chet Morton, the brothers needs to take on the secret of the mansion heir’s unexpected demise. A disappearing ground, a massive, savage-looking, hound, a galloping ghost, and a school professor’s startling invention are only the various unusual parts that complicate the men’ efforts to unravel either mysteries.