WARNING! CONTAINS A SPOILER FOR THE SEA OF MONSTERS, THE PREVIOUS BOOK IN THE SERIES!
Another year, another adventure for Percy Jackson, demi-god son of Poseidon. He, his friend Annabeth (daughter of Athena) and recently turned back from a tree, Thalia (daughter of Zeus) are at a military academy on the lookout for two half-mortal kids they believe may be in danger. Shortly after finding the two half-bloods, Bianca and Nico, things go horribly wrong. A giant manticore tries to kill them, the goddess Artemis intervenes, and Annabeth falls off a cliff while fighting the manticore.
Artemis travels with a team of eternally adolescent young girls, who have all gained immortality in return for staying chaste and loyal to the goddess of the Hunt forever. Her second in command is a very hostile girl who Thalia calls Zoe Nightshade. Zoe and the rest of the hunters are ordered to go with Thalia, Percy, Bianca and Nico to Camp Half-Blood, while Artemis hunts a legendary monster that may bring about the end of the Gods. But before she leaves, Bianca joins her little crew of adolescent huntresses. Nico is too busy collecting Greek myth trading cards to really care.
The group have not been back at camp long before it becomes obvious that Annabeth is not the only half-blood to have disappeared recently. Percy is convinced she is still alive, as he keeps having dreams where he sees her in danger, just like he saw Grover in danger in the last book. After a few days back, they receive news that Artemis has been captured, and a quest has to be launched to save her. Zoe refuses to have any men with them, but the Oracle claims they have to bring both half-bloods and hunters, or the quest will fail. When at the last minute, one of the hunters can't come, Percy sneaks after the group wearing Annabeth's cap of invisibility. He knows that she is in the same place as Artemis, as he has seen them together in his portentous dreams.
The series really holds up, and is a lot of fun to read. It is clear that if Aphrodite gets her way, Percy and Annabeth are on their way to one heck of a tragic romance, not entirely sure if they want to play into her hands, although Percy is getting more and more taken with his friend. He is certainly very worried when he found out that she was considering joining Artemis' huntresses, thereby swearing off boys forever.
Even more Greek mythology is explored. As well as the manticore, there are pegasi, cow serpents, zombies made from dragon's (well, technically dinosaur) teeth, we find out more about Artemis and Apollo, the Hesperides, their father, and yet again Percy and his friends have to work to save the Greek pantheon and the world from destruction. The books follow a formula, but are enjoyable nonetheless.