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Twin Thriller Book Club Editions

These books were published with two mysteries in each volume for volumes 1-54.  They were not produced for 55 Mystery of Crocodile Island and 56 The Thirteenth Pearl.  The predominant cover color is lavender.  In addition, these volumes were produced in two sizes.  On the lower back cover, there is a publisher's number.  The smaller books begin 106.. and the larger volumes begin 116..

Click on the book name to see details (If no link, none available at this time, please check back)

1-2  The Secret of the Old Clock/The Hidden Staircase 10601

3-4  The Bungalow Mystery/The Mystery at Lilac Inn 10602

5-6  The Secret at Shadow Ranch/The Secret of Red Gate Farm 10603

7-8 The Clue in the Diary/Nancy's Mysterious Letter 10604

9-10  The Sign of the Twisted Candles/The Password to Larkspur Lane 10605

11-12  The Clue of the Broken Locket/The Message in the Hollow Oak 10606

13-14  The Mystery of the Ivory Charm/The Whispering Statue 10607

15-16  The Haunted Bridge/The Clue of the Tapping Heels 10608

17-24  The Mystery of the Brass Bound Trunk/The Clue in the Old Album 10627

18-19  The Mystery at the Moss-Covered Mansion/The Quest of the Missing Map  10609

20-21 The Clue in the Jewel Box/The Secret in the Old Attic 10610

22-23 The Clue in the Crumbling Wall/The Mystery of the Tolling Bell 10611

25-26 The Ghost of Blackwood Hall/The Clue of the Leaning Chimney 10612

27-28 The Secret of the Wooden Lady/The Clue of the Black Keys 10613

29-30 The Mystery at the Ski Jump/The Clue of the Velvet Mask 10614

31-32 The Ringmaster's Secret/The Scarlet Slipper Mystery 10615

33-34 The Witch Tree Symbol/The Hidden Window Mystery 10625

35-36 The Haunted Showboat/The Secret of the Golden Pavilion 10616

37-38 The Clue in the Old Stagecoach/The Mystery of the Fire Dragon 10617

39-40 The Clue of the Dancing Puppet/The Moonstone Castle Mystery 10618

41-42 The Clue of the Whistling Bagpipes/The Phantom of Pine Hill 10619

43-44 The Mystery of the 99 Steps/The Clue in the Crossword Cipher 10620

45-46 The Spider Sapphire Mystery/The Invisible Intruder 10621

47-48 The Mysterious Mannequin/The Crooked Bannister  10622

49-50 The Secret at Mirror Bay/The Double Jinx Mystery 10623

51-52 Mystery of the Glowing Eye/The Secret of the Forgotten City 10624

53-54 The Sky Phantom/The Strange Message in the Parchment 10626