The Message in the Hollow Oak
Original edition cover  | |
| Author | Carolyn Keene | 
|---|---|
| Illustrator | Russell H. Tandy | 
| Language | English | 
| Series | Nancy Drew Mystery Stories | 
| Genre | Juvenile literature | 
| Publisher | Grosset & Dunlap | 
Publication date  | 1935, 1972 | 
| Publication place | United States | 
| Media type | Print (Hardback & Paperback) | 
| Preceded by | The Clue of the Broken Locket | 
| Followed by | The Mystery of the Ivory Charm | 
The Message in the Hollow Oak is the twelfth volume in the Nancy Drew Mystery Stories series. It was written under the pseudonym Carolyn Keene and first published in 1935.