- The Battle of the Labyrinth, by Rick Riordan
Thalia’s Tree has always kept Camp Half-Blood protected with its magic extending around its borders. An earlier attempt to poison it had failed, and now the tree was guarded by a dragon.
But even with its magical borders, Camp Half-Blood was no longer safe. An old mound of rocks inside the camp had been found to contain an entrance to The Labyrinth, a massive underground structure built centuries before, a structure which is almost sentient, and has been growing ever since it was built.
A structure which now contains a direct entrance into the Camp, and which now holds, somewhere in its maze, an army of monsters & half-bloods loyal to the Titan Kronos, determined to overrun the one place still safe for half-bloods loyal to the gods.
So now it’s up to Annabeth, daughter of Athena, to lead a quest to search for the center of the Labyrinth to find Daedauls, the greatest architect of all time the greatest inventor of all time, and the creator of the Labyrinth. Along with Annabeth goes Percy Jackson, son of Zeus and suspected subject of the prophecy from Book #3 (See the Review for The Titan’s Curse for details **WARNING - CONTAINS SPOILERS**), and his half-brother, the Cyclops Tyson. Also along is the satyr Grover, who has been searching for Pan, the lost god of nature, all his life, and with whom he’ll finally have a fateful encounter. And what in the world does the fiery red-headed mortal girl Rachel Elizabeth Dare have to do with all this?
Along the way our heroes must grow up. Grover & Tyson must find a way to deal with idols who are not what they expected. Annabeth finds it hard to deal with the realization that as brilliant as she is, she just may need help from the unlikeliest of places. And Percy Jackson must decide, just like all the other half-bloods, on whose side he is on. And more importantly, why:
“Tell me, Percy… do you support the gods because they are good, or because they are your family?”

With each review you peak my curiousity even more about this series! ;o)
Hey guys! A friend sent me a link to a website I think might interest you!
http://www.neglectedbooks.com/
Interesting… I just ran into this site three days ago. There was an article on the Wall Street Journal on 7/2/09, where a reader asks why authors “disappear”, and the article author includes this site in her response:
http://online.wsj.com/article/SB10001424052970204556804574260451110396092.html
Thanks for bringing it up, by the way! I was remiss in not mentioning it.