The Heroes of Olympus

9 titles

1. 1. The Lost Hero
2. 1.5. The Heroes of Olympus
3. 2. The Son of Neptune
4. 2.5. The Demigod Diaries
5. 3. The Mark of Athena
6. 4. The House of Hades
7. 4.5. Percy Jackson's Greek Gods
8. 5. The Blood of Olympus
9. 5.5. Percy Jackson's Greek Heroes