The secret panel (engelsk)

Del 1 - The tower treasure

Franklin W. Dixon

Del 2 - The house on the cliff

Franklin W. Dixon

Del 3 - The secret of the old mill

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Del 4 - The missing chums

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Del 5 - Hunting for hidden gold

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Del 6 - The Shore Road mystery

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Del 7 - The secret of the caves

Franklin W. Dixon

Del 8 - The mystery of Cabin Island

Franklin W. Dixon

Del 9 - The great airport mystery

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Del 10 - What happened at midnight

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Del 11 - While the clock ticked

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Del 12 - Footprints under the window

Franklin W. Dixon

Del 13 - The mark on the door

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Del 14 - The hidden harbor mystery

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Del 15 - The sinister signpost

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Del 16 - A figure in hiding

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Del 17 - The secret warning

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Del 18 - The twisted claw

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Del 19 - The disappearing floor

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Del 20 - Mystery of the Flying Express

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Del 21 - The clue of the broken blade

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Del 23 - The flickering torch mystery

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Del 23 - The melted coins

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Del 24 - The shortwave mystery

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Del 25 - The secret panel

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Del 26 - The phantom freighter

Franklin W. Dixon

Del 27 - The secret of Skull Mountain

Franklin W. Dixon

Del 28 - The sign of the crooked arrow

Franklin W. Dixon

Del 29 - The secret of the lost tunnel

Franklin W. Dixon

Del 30 - The wailing siren mystery

Franklin W. Dixon

Del 31 - The secret of the Wildcat Swamp

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Del 32 - The crisscross shadow

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Del 33 - The yellow feather mystery

Franklin W. Dixon

Del 34 - The hooded hawk mystery

Franklin W. Dixon

Del 35 - The clue in the embers

Franklin W. Dixon

Del 36 - The secret of Pirates' Hill

Franklin W. Dixon

Del 37 - The ghost at Skeleton Rock

Franklin W. Dixon

Del 38 - The mystery at Devil's Paw

Franklin W. Dixon

Del 39 - The mystery of the chinese junk

Franklin W. Dixon

Del 40 - Mystery of the desert giant

Franklin W. Dixon

Del 41 - The clue of the screeching owl

Franklin W. Dixon

Del 42 - The viking symbol mystery

Franklin W. Dixon

Del 43 - The mystery of the Aztec warrior

Franklin W. Dixon

Del 44 - The haunted fort

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Del 45 - The mystery of the spiral bridge

Franklin W. Dixon

Del 46 - The secret agent on flight 101

Franklin W. Dixon

Del 47 - The mystery of the whale tattoo

Franklin W. Dixon

Del 48 - The arctic patrol mystery

Franklin W. Dixon

Del 49 - The Bombay boomerang

Franklin W. Dixon

Del 50 - Danger on Vampire Trail

Franklin W. Dixon