Will, sometimes an enemy must become an ally. Your friend and ally, Evanlyn, has been taken captive by a mysterious horseman. Your attempts to rescue her lead you into the territory of a fearsome new enemy. Now, you must unite with old rivals to vanquish this greater threat. But can the fragile truce survive the battle?

An incredible, brand-new spin-off series from the best-selling creator of Percy Jackson.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.But rumours of a terrible curse - and a missing hero - are flying aroun...