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 HAL KEEN MYSTERY STORIES By HUGH LLOYD Boys ! Meet Hal Keen, that lanky, nonchalant, red headed youth whose guiding star is the star that points to adventure, excitement and mystery. Follow him in his hunts for clues and criminals. There are plenty of thrills and shivers in these stories to keep you on your toes. THE SMUGGLER'S SECRET Hal Keen sets out to get to the bottom of a mystery that threatens the safety of a whole community. THE MYSTERIOUS ARAB Mystery, excitement, murder in a scientist's camp in the jungles of Africa, where hate, revenge, and suspicion lead to tragedy. THE HERMIT OF GORDON'S CREEK The disappearance of two airmail pilots leads to a mystery that centers about an abandoned mine and a strange old man. KIDNAPPED IN THE JUNGLE A hint of buried treasure in the ruins of an old French mission leads Hal deep into the Central American jungle. THE COPPERHEAD TRAIL MYSTERY Baffling and blood-curdling events center about the ranch where Hal Keen and his friends had gone in search of gold. THE LONESOME SWAMP MYSTERY The lonely and mysterious swamp gave up its secret only after a series of terrifying events taxed Hal's courage and ability. THE CLUE AT SKELETON ROCKS In this new thriller Hal Keen finds mystery and adventure in and about a lonely lighthouse on Skeleton Rocks, oS the Maine coast. THE DOOM OF STARK HOUSE Mystery and terror in an old house in the wilderness above Quebec where Hal Keen is the guest of a strange family. GROSSET & DUNLAP, PUBLISHERS, NEW YORK