Book four of the Percy Jackson series!
In this novel, Percy and his friends must continue their quest against the evil Titan Kronos - whose army is ready for the war against Olympus, and whose earthly form is practically fully formed. Also, the Titan's forces are ready to march on Camp Half-Blood and destroy it, but all they're missing is one little thing, a way to navigate the Labyrinth. Yes, Daedalus's Labyrinth still exists (or rather, lives), and like everything else associated with Hellenic gods it has moved to the U.S., where it's become a handy (if confusing and often lethally dangerous) way of moving about quickly.
Daedalus, his son Icarus, the (somewhat evil) king Minos, and their story are all involved in this story; and as the next war between the gods and the Titans approaches, our main characters (Percy, Annabeth, Grover, Tyson, etc.) keep growing, gain allies, and lose friends. Plus, is that the lost god of the wild, Pan, that the satyrs (including Grover) have been searching for for two thousand years? (Warning: this particular quest will feature a famous Thus Spake Zarathustra line.)
As with all the other novels in this excellent series, the tone and pace of this story makes it a joy to read, and the way the author plays with themes and elements of Greek mythology makes my inner mythology geek very happy indeed. Seriously, I'll start gushing about the sheer awesomeness of this series if I don't end this post now.