Title: The Disappearing Floor
Description: 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.
Subjects: Jewel thieves, Detective and mystery stories, Mystery fiction, Juvenile fiction, Mystery and detective stories, Hardy Boys (Fictitious characters), Children's fiction, Hardy boys (fictitious characters), fiction, Robbers and outlaws, fiction, series:HardyBoys, collectionID:HBMS1