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THE SECRET OF SKELETON ISLAND -- 1949, Grosset & Dunlap.
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THE RIDDLE OF THE STONE ELEPHANT -- 1949, Grosset & Dunlap.
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THE BLACK THUMB MYSTERY -- 1950, Grosset & Dunlap.
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THE CLUE OF THE MARKED CLAW -- 1950, Grosset & Dunlap.
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THE CLUE OF THE COILED COBRA -- 1951, Grosset & Dunlap.
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THE SECRET OF HANGMAN'S INN -- 1951, Grosset & Dunlap.
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THE MYSTERY OF THE IRON BOX -- 1952, Grosset & Dunlap.
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THE CLUE OF THE PHANTOM CAR -- 1953, Grosset & Dunlap.
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THE MYSTERY OF THE GALLOPING HORSE -- 1954, Grosset & Dunlap.
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THE MYSTERY OF THE GREEN FLAME -- 1955, Grosset & Dunlap.
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THE MYSTERY OF THE GRINNING TIGER -- 1956, Grosset & Dunlap.
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THE MYSTERY OF THE VANISHING MAGICIAN -- 1956, Grosset & Dunlap.
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THE MYSTERY OF THE SHATTERED GLASS -- 1958, Grosset & Dunlap.
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THE MYSTERY OF THE INVISIBLE ENEMY -- 1959, Grosset & Dunlap.
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THE MYSTERY OF GALLOWS CLIFF -- 1960, Grosset & Dunlap ; 1998, Amereon House.
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THE CLUE OF THE SILVER SCORPION -- 1961, Grosset & Dunlap.
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THE MYSTERY OF THE PLUMED SERPENT -- 1962, Grosset & Dunlap.
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THE MYSTERY OF THE SULTAN'S SCIMITAR -- 1963, Grosset & Dunlap.