DESAFIOS
01. The Secret of the Old Clock, 195902. The Hidden Staircase, 195903. The Bungalow Mystery, 196004. The Mystery at Lilac Inn, 196105. The Secret of Shadow Ranch, 196506. The Secret of Red Gate Farm, 196107. The Clue in the Diary, 196208. Nancy's Mysterious Letter, 196809. The Sign of the Twisted Candles, 196810. The Password to Larkspur Lane, 196611. The Clue of the Broken Locket, 196512. The Message in the Hollow Oak, 197213. The Mystery of the Ivory Charm, 197414. The Whispering Statue, 197015. The Haunted Bridge, 197216. The Clue of the Tapping Heels, 196917. The Mystery of the Brass Bound Trunk, 197618. Mystery of the Moss-Covered Mansion, 197119. The Quest of the Missing Map, 196920. The Clue in the Jewel Box, 197221. The Secret in the Old Attic, 197022. The Clue in the Crumbling Wall, 197323. The Mystery of the Tolling Bell, 197324. The Clue in the Old Album, 197725. The Ghost of Blackwood Hall, 196726. The Clue of the Leaning Chimney, 196727. The Secret of the Wooden Lady, 196728. The Clue of the Black Keys, 196829. The Mystery at the Ski Jump, 196830. The Clue of the Velvet Mask, 196931. The Ringmaster's Secret, 197432. The Scarlet Slipper Mystery, 197433. The Witch Tree Symbol, 1975- 34. The Hidden Window Mystery, 1975
- 35. The Haunted Showboat, 1957
36. The Secret of the Golden Pavilion, 195937. The Clue in the Old Stagecoach, 196038. The Mystery of the Fire Dragon, 196139. The Clue of the Dancing Puppet, 196240. The Moonstone Castle Mystery, 196341. The Clue of the Whistling Bagpipes, 196442. The Phantom of Pine Hill, 1965- 43. The Mystery of the 99 Steps, 1966
44. The Clue in the Crossword Cipher, 1967- 45. The Spider Sapphire Mystery, 1968
46. The Invisible Intruder, 196947. The Mysterious Mannequin, 197048. The Crooked Banister, 197149. The Secret of Mirror Bay, 197250. The Double Jinx Mystery, 1973- 51. Mystery of the Glowing Eye, 1974
52. The Secret of the Forgotten City, 197553. The Sky Phantom, 197654. The Strange Message in the Parchment, 1977- 55. Mystery of Crocodile Island, 1978
56. The Thirteenth Pearl, 1979
