In a search for the missing Willard Grafton, Frank Hardy and younger brother Joe, encounter a gang of criminals intent on defrauding the US government, and are lead across California and even into Mexico.
| ISBN: | 9780448089409 |
| Publication date: | 1st December 1960 |
| Author: | Franklin W Dixon |
| Publisher: | Grosset & Dunlap an imprint of Penguin Young Readers Group |
| Format: | Hardback |
| Pagination: | 192 pages |
| Series: | The Hardy Boys |
| Genres: |
Crime & Mystery PSHE: Siblings Adventure Stories Stories about Family and Friends |