The Mysterious Mannequin The Crooked Banister
| Editor | Grosset & Dunlap |
| Series | Nancy Drew Mystery Stories |
| Other | Twin Thriller Edition |
| Format | Hardback |
| Location | New York |
| Copyright | 1977 |
| Other | 10622 |
| Notes | Purple Cover, Double Title |
Added by jlkrien
| Editor | Grosset & Dunlap |
| Series | Nancy Drew Mystery Stories |
| Other | Twin Thriller Edition |
| Format | Hardback |
| Location | New York |
| Copyright | 1977 |
| Other | 10622 |
| Notes | Purple Cover, Double Title |