Annabeth and her friends Jason, Pier, and Leo are approaching Camp Jupiter to attempt to make peace between the Greek and Roman demigods. The world is literally at stake, because if the heroes can't band together there's no way they can't find and close the Doors of Death. And if they can't do that, then they definitely won't be able to stop Gaia's monsters from taking over the earth. Despite all of that, Annabeth is still anxious about being reunited with Percy after six months of separation. And her mother's odd demand still rings in her ears: "Follow the Mark of Athena. Avenge me." And she's not the only one with doubts. All seven of the demigods are dealing with their own personal fears, insecurities, even unrequited love. It's going to take all they have to pull together and complete this leg of their quest.
I love this series, and almost everything about it. There's lots of action, but the characters are well developed, too. The humor is fun and cheesy as ever. The plot has several twists and turns. It's one of those that there's not a lot to say about, as it's just good simple fun.