The Mystery of the Flying Express
| Publisher | Grosset & Dunlap |
| Publisher Series | Hardy Boys Mystery Stories |
| Series | The Hardy Boys |
| Format | Hardback |
| Language | English |
| Location | New York |
| Copyright | 1941 |
| Pages / Font | 217 pages |
| Series Number | 20 |
Added by jlkrien · Last edited by miketaylor81