The Flames of Last Hearth (Book One of The Chronicles of Olympus)

Long ago the Greek gods ruled the Earth. They were worshipped by many and feared by others. Now, thousands of years later they live on in secret with two choices before them: adapt to survive in this new world or die. For the most part, the gods have done well, none more so than the Olympians Hermes, Apollo, Artemis, and Ares. However, when the presence of an ancient evil threatens to undo the lives of the Olympians, only the God of War and Rage, the Goddess of the Hunt and the Moon, the God of the Sun and Prophecy, the God of Messengers and Speed, and their allies stand in the way of their plans to throwing the world back into the Dark Times.

(Rated M for violence, scariness, gore, nudity, language, sexual content, alcohol/drug use)