You mean Percy Jackson and The Olympian Series? It's called The Battle Of the Labyrinth.
Battle of the Labyrinth
The Battle Of the Labyrinth is the fourth book in the Percy Jackson series.
1. Percy Jackson and the Lightning Theif. 2. Percy Jackson and the Sea of Monsters. 3. Percy Jackson and the Titan's Curse. 4. Percy Jackson and the Battle of the Labyrinth. 5. Percy Jackson and the Last Olympian. After this, the series ends and a new one begins, which is Heroes of Olympus. It still involves Percy Jackson and his friends, but there are a bunch of new characters and it involves a fair bit of Roman mythology aswell. It follows a new story line, with a whole new threat. (No longer is Kronos the threat.) There are two out in the Heroes of Olympus series as far as I know: 1. Heroes of Olympus: the Lost Hero. 2. Heroes of Olympus: the Son of Neptune. Hope that helped!
the last olympian in Percy Jackson and the Olympians series. A new series about Egyptian mythology is suposed to come out may 4th, 2010. The book is called The Red Pyramid (check out rick Riordan's blog Myth and Mystery at rickriordan.blogspot.com)
The fifth book already came out on May 4th, 2009. And there will be a Percy Jackson and the Olympians: The Lightning Thief movie coming out on February 12, 2010.
There will not be a fourth book in the series because the series is a trilogy.
THere is no fourth book. The series of Seekers is composed of three books.
It is already out and it is called Closer 4th book of the series.
Halo: Ghost of Onyx is the 4th book in the Halo series.
Yes. It is call Peter and the Sword of Mercy
It is the 4th book in the Twilight series.
The fourth book of the Power of Three series is called Eclipse.