The disappearing floor - Franklin W. Dixon

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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.