The Heroes of Olympus
by Rick Riordan
Book 1: THE LOST HERO
Book 2: THE SON OF NEPTUNE
Book 3: THE MARK OF ATHENA
Book 4: THE HOUSE OF HADES
Book 5: THE BLOOD OF OLYMPUS
Book 2: THE SON OF NEPTUNE
Book 3: THE MARK OF ATHENA
Book 4: THE HOUSE OF HADES
Book 5: THE BLOOD OF OLYMPUS