Once again Frank and Joe Hardy take on a puzzling case when their famous detective father asks the boys to assist him in tracking down a notorious jewel thief and his accomplices. The trail leads to the outskirts of the Hardys? home town and to a weirdly guarded mansion on the old Perth estate. With their pal Chet Morton, the brothers must tackle the mystery of the mansion heir?s sudden death. A disappearing floor, a huge, savage-looking, hound, a galloping ghost, and a college professor?s startling invention are just a few of the strange elements that complicate the boys? efforts to solve both mysteries.