The Clue of the Black Keys
| Author | Carolyn Keene |
|---|---|
| Language | English |
| Series | Nancy Drew stories |
| Genre | Detective, mystery |
| Publisher | Grosset & Dunlap |
Publication date | 1951 |
| Publication place | United States |
| Media type | Print (hardback & paperback) |
| Preceded by | Nancy Drew: The Secret of the Wooden Lady |
| Followed by | Nancy Drew: The Mystery at the Ski Jump |
The Clue of the Black Keys is the twenty-eighth volume in the Nancy Drew mystery series. It was first published in 1951 under the pseudonym Carolyn Keene. The actual authors were ghostwriters Wilhelmina Rankin and Harriet Stratemeyer Adams.