Hardy-guttene og hydrofoil-mysteriet

Blurb

The Mystery Of The Flying Express is Volume 20 in the original The Hardy Boys Mystery Stories published by Grosset & Dunlap.
This book was written for the Stratemeyer Syndicate by John Button in 1941. Between 1959 and 1973 the first 38 volumes of this series were systematically revised as part of a project directed by Harriet Adams, Edward Stratemeyer's daughter. The original version of this book was rewritten in 1970 by Vincent Buranelli and retitled to Mystery of the Flying Express.