The Secret in the Sand Castle
| Illustrator | Paul Jennis |
| Series | The New Bobbsey Twins |
| Publisher | Pocket Books |
| Format | Paperback |
| Copyright | 1988 |
| Pages / Font | 85 pages |
| Series Number | 4 |
| ISBN | 0-671-62654-X |
Added by miketaylor81
| Illustrator | Paul Jennis |
| Series | The New Bobbsey Twins |
| Publisher | Pocket Books |
| Format | Paperback |
| Copyright | 1988 |
| Pages / Font | 85 pages |
| Series Number | 4 |
| ISBN | 0-671-62654-X |