Nominated for the Cybils by Kate.
Percy Jackson is still missing, and Annabeth is going in search of him. First, however, three new children of the gods show up at Camp Half-Blood. Leo is the son of Hephaestus who also has the ability to withstand fire. He is still grieving the death of his mortal mother, has the ability to fix just about anything mechanical, and is attracted to girls who don't like him. Piper, whose mortal father is a movie star, is the daughter of Aphrodite, which explains how she was able to talk people into giving her things (which were then assumed to be stolen). Lastly, we have Jason, who has lost all of his memories but is the son of Zeus in his Roman incarnation as Jupiter, and as such, is in the greatest peril of them all. After a prophecy is revealed, the three form a team and take off across the US and Canada, meeting Medea, King Midas, and others in their quest to rescue Hera, who has been captured as part of an uprising that can only be squelched by connecting with the camp of the Roman gods, where they believe Percy might be.
Strengths: Riordan must be the most dedicated writer alive-- he travels to meet his fans and can keep churning out books. The use of Greek and Roman mythology is still fascinating, and the writing is fun. Can you say "chain-mail muu muu" without laughing? This will be hugely popular, and was a clever way to continue the story without making us tired of Percy.
Also, there is some Latin that may be incorrect, but I tried not to look at it because I really didn't want to know how wrong it was. Sigh. What have we said, people? Any author who tries to put Latin into a YA book needs to check with me first! I haven't taught Latin in 18 years, but if I can tell it's wrong, it must be really wrong!