|Title and Author/Editor:||The Hidden Staircase, The Bungalow Mystery, The Secret at Shadow Ranch, The Sign of the Twisted Candles, The Message in the Hollow Oak, The Haunted Bridge, The Mystery of the Brass Bound Trunk, The Clue in the Jewel Box, The Clue in the Crumbling Wall, The Mystery of the Tolling Bell, The Clue in the Old Album, The Clue of the Black Keys (two copies), The Scarlet Slipper Mystery (Carolyn Keene)|
|Genre:||Mystery, Crime and Detective, Children’s|
|Binding:||Blue tweed cloth|
|Publisher:||Grosset & Dunlap|
|Publication Year:||1951 – 1961|
|Place of Publication:||New York|
|Number of Books:||14|
|Additional Notes:||All volumes feature 25 chapters, 210 to 225 pages and the silhouette, digger, or multiple picture endpapers; one volume has its original dust jacket.|
- wear to the covers with fraying, rubbed edges, bumped corners, missing dust jackets, scorching, missing material, loose spine material and soiling; writing to endpapers; cracked hinges; tanning to text blocks; dust jacket is chipped, torn and soiled.
- measures The Sign of the Twisted Candle.