The Hardy Boys: The Disappearing Floor
by: Dixon, Franklin W.

Hardcover. NY, Grosset & Dunlap, reprint, Book: Very Good, Dust Jacket: Very Good, Hardcover in a bright dust jacket. First published in 1940, The Disappearing Floor is the 19th book in the Hardy Boys series. This appears to be a 1950s reprint. 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. Clean copy, paper tanning.