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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..

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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