When the World War broke out, Bob Cook and his friend Hugh were in High School. They chafed at being too young to enlist, but soon found that there was plenty to do for their country right at home. And later they found that they could do still bigger things.
These are real boys' books for real boys. Each story contains mystery, excitement, or adventure from the very first chapter to the last.
Cloth, Large 12 mo., Illustrated.
| Bob Cook and the German Spy |
| Bob Cook and the German Air Fleet |
| Bob Cook's Brother in the Trenches |
| Bob Cook and the Winged Messengers |
| Bob Cook and the Bomb Plot |