The Hardy Boys Series

10 titles

1. 1. The Tower Treasure
2. 2. The House on the Cliff
3. 3. The Secret of the Old Mill
4. 4. The Missing Chums
5. 5. Hunting for Hidden Gold
6. 6. The Shore Road Mystery
7. 7. The Secret of the Caves
8. 8. The Mystery of Cabin Island
9. 9. The Hardy Boys: The Great Airport Mystery
10. 10. What Happened at Midnight