01094    a2200193   4500001000700000020001800007020000900025041000800034082001000042245003500052246002700087490003500114520061700149856002400766040002500790260003700815300001700852700003100869118606  a9780448089195  qenc.  aeng  a[Fic]10aThe Hardy boys mystery stories  aThe disappearing florr  aThe Hardy boys mystery stories  aOnce 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.  u000031/0000315d.jpg  aBR-BrIDEAcBR-BrIDEA  aNew YorkbGrosset & Dunlapc1992  a180 p.bill.  aDixon, Franklin W.eauthor