This Complete Collection Include These Titles
1: The Tower Treasure
2: The House on the Cliff
3: The Secret of the Old Mill
4: The Missing Chums
5: Hunting for Hidden Gold
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
11: While the Clock Ticked
12: Footprints Under the Window
13: The Mark on the Door
14: The Hidden Harbor Mystery
15: The Sinister Signpost
16: A Figure in Hiding
17: The Secret Warning
18: The Twisted Claw
19: The Disappearing Floor
20: Mystery of the Flying Express
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
27: The Secret of Skull Mountain
28: The Sign of the Crooked Arrow
29: The Secret of the Lost Tunnel
30: The Wailing Siren Mystery
31: The Secret of Wildcat Swamp
32: The Crisscross Shadow
33: The Yellow Feather Mystery
34: The Hooded Hawk Mystery
35: The Clue in the Embers
36: The Secret of Pirates' Hill
37: The Ghost at Skeleton Rock
38: Mystery at Devil's Paw
39: The Mystery of the Chinese Junk
40: Mystery of the Desert Giant
41: The Clue of the Screeching Owl
42: The Viking Symbol Mystery
43: The Mystery of the Aztec Warrior
44: The Haunted Fort
45: The Mystery of the Spiral Bridge
46: The Secret Agent on Flight 101
47: Mystery of the Whale Tattoo
48: The Arctic Patrol Mystery
49: The Bombay Boomerang
50: Danger on Vampire Trail
51: The Masked Monkey
52: The Shattered Helmet
53: The Clue of the Hissing Serpent
54: The Mysterious Caravan
55: The Witchmaster's Key
56: The Jungle Pyramid
57: The Firebird Rocket
58: The Sting of the Scorpion
59: Night of the Werewolf
60: Mystery of the Samurai Sword
61: The Pentagon Spy
62: The Apeman's Secret
63: The Mummy Case
64: Mystery of Smuggler's Cove
65: The Stone Idol
66: The Vanishing Thieves
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