1. The Secret of the Old Clock, The Hidden Staircase 1959

2. The Bungalow Mystery, The Mystery At Lilac Inn 1960

3. The Ghost of Blackwood Hall, The Clue of The Leaning Chimney 1967

4. The Secret of The Wooden Lady, The Clue of The Black Keys 1967

5. Mystery at The Ski Jump, The Clue of The Velvet Mask 1968

6. The Mystery of The Moss-Covered Mansion, The Quest of The Missing Map 1971

7. The Clue in The Jewel Box, The Secret in The Old Attic 1972

8. The Clue in The Crumbling Wall, Mystery of The Tolling Bell 1973

PRE-OWNED. Hardcovers may have wear, scrapes, tears, fading and stains. Inside pages have wear, stains, tears and browning. One book has water damage. One book has the second page torn out, but is not part of the story. Edges have wear and stains. SEE PHOTOS for condition of books. Photos do not show all flaws.