this is the 4th part of the best ever series of p.j.this book takes us into the underworld's depths along with Percy , annabeth , Grover , and Tyson. this also depicts the arrival of the greatest inventor- daedalus and of the hatred between Nico and Percy. It also brings an epic battle.

The Battle of the Labyrinth by Rick Riordan is the fourth volume in the Percy Jackson and the Olympians series. And it is the best yet! Action, revelations, character development, everything. In this book, all the characters continue to develop along their paths, and the series grows up a bit. In this entry, Percy, Annabeth, and Grover are shocked to discover that there is an entrance to *the* world-famous labyrinth, hidden right there in Camp Half Blood. Due to some outside circumstances, the trio's talents are required to enter the Labyrinth and fight their way to meet Daedalus for some help. I don't like to spoil much when reviewing series books, but let me just say that new characters are introduced (Rachel Elizabeth Dare, anyone?) and some of the adult-ey, romance aspects are played it up. But this book still holds on to the series roots while growing off into different directions. Riordan's writing is always humorous and witty, and he has again captured the voices of *all* the characters. Like the great series writers past, Riordan has a strong ensemble cast and uses them all deftly and appropriately, without getting too confusing or contrived. What's so great about these books is that they truly can be enjoyed by all ages. Meaning: I'm 17, I love the whole series. My little brother, 13, was pleased by them as well. And I can tell that I wouldn't mind re-reading them all in the near future, either. Although this could have fallen victim to Two-Towers "middle-of-the-series" syndrome, it doesn't. Plot lines are introduced, resolved, and, like I mentioned earlier, the conflict is deepening again. Riordan is taking a universal battle-- good vs. evil-- and zooming in on it to cover finer themes of love, loss, and growing up. And it works. Obviously if you've read this far in the series, you're going to continue with the fabulous The Last Olympian (Percy Jackson & the Olympians, Book 5), which ties with this one for the best book in the series. Good Luck and feast on the exciting read in front of you!