Heroes of Olympus 01. The Lost Hero

The number one, bestselling title in this new spin-off series from Percy Jackson creator, Rick Riordan. Old enemies awaken as Camp Half-Blood's new arrivals prepare for war. When Jason, Piper and Leo crash land at Camp Half-Blood, they have no idea what to expect. Apparently this is the only safe place for children of the Greek Gods - despite the monsters roaming the woods and demigods practising archery with flaming arrows and explosives.