Hardy Boys Mystery Series
Franklin W. Dixon
Hardcover
(Grosset & Dunlap (1970-1977, 1988, 1991-1995), March 15, 1995)
Brothers Frank and Joe Hardy solve many cases in this mystery series for ages 9 to 12. Books include:#6, The Shore Road Mystery; #7, The Secret of the Caves; #8, The Mystery of Cabin Island; #9, The Great Airport Mystery; #10, What Happened at Midnight; #12, Footprints Under the Window; #17, The Secret Warning; #21, The Clue of the Broken Blade; #22, The Flickering Torch Mystery; #23, The Melted Coins; #24, The Short-Wave Mystery; #25, The Secret Panel; #26, The Phantom Freighter; #39, The Mystery of the Chinese Junk; #42, The Viking Symbol Mystery; #51, The Masked Monkey; #52, The Shattered Helmet; #53, The Clue of the Hissing Serpent; #54, The Mysterious Caravan; #55, The Witchmaster's Key.