The Dark Prophecy (The Trials of Apollo Book 2) (The Trials of Apollo, 2)+The Mark of Athena (Heroes of Olympus Book 3) (Heroes of Olympus, 3)
Heroes of Olympus: The Son of Neptune (Heroes of Olympus, 2)+The Mark of Athena (Heroes of Olympus Book 3) (Heroes of Olympus, 3)
