The Mark of Athena (Heroes of Olympus Book 3) Other Books in This Series

The House of Hades (Heroes of Olympus Book 4) The House of Hades (Heroes of Olympus Book 4)
The House of Hades (Heroes of Olympus Book 4)
2014
The Blood of Olympus (Heroes of Olympus Book 5) The Blood of Olympus (Heroes of Olympus Book 5)
The Blood of Olympus (Heroes of Olympus Book 5)
2014
The Lost Hero (Heroes of Olympus Book 1) The Lost Hero (Heroes of Olympus Book 1)
The Lost Hero (Heroes of Olympus Book 1)
2014
The Son of Neptune (Heroes of Olympus Book 2) The Son of Neptune (Heroes of Olympus Book 2)
The Son of Neptune (Heroes of Olympus Book 2)
2014