There is no sixth book in Percy Jackson. However, there is going to be a new series which is called Heroes of Olympus.
Percy, Annabeth, and Grover do appear in this series, but they are not the main characters. The first book in Rick Riordan's new series will be called The Lost Hero. It will be released on October 12th, 2010.
Please see the related link(s) to read the first two chapters of the Lost Hero.
Rick Riordan ended the Percy Jackson and the Olympian series after book five. However, he does have two new series out that include demi-gods. One is "The Kane Chronicles." It is based in Egypt, and involves a good deal of Egyptology, naturally. The other is the upcoming "Heroes of Olympus." It is based on a different set of characters, but is supposed to have appearances by some of the characters from the Percy Jackson series.
No. Percy Jackson and the Olympians is the full name of the series, while Percy Jackson is the shortened, abbreviated name people like to use (it's a lot easier to say). The real second book of the series is Percy Jackson and the Sea of Monsters.
Annabeth's last name in the series of Percy Jackson and the Olympians is Chase.
dingberry
The Battle Of the Labyrinth is the fourth book in the Percy Jackson series.
The Battle of the Labyrinth The fourth Percy Jackson and the Olympians book is called Battle of the Labyrinth, and was released on May 6th, 2008 in the U.S.
Book 5: Percy Jackson and the Olympians: The Last Olympian
Poseidon, king of the sea
No. Percy Jackson and the Olympians is the full name of the series, while Percy Jackson is the shortened, abbreviated name people like to use (it's a lot easier to say). The real second book of the series is Percy Jackson and the Sea of Monsters.
Annabeth's last name in the series of Percy Jackson and the Olympians is Chase.
dingberry
In Percy Jackson and the Olympians her name is Sally Jackson. In mythology her name is Danae.
The name of the series or the character's name? I'll give you both: Series Name: Percy Jackson and the Olympians Character Name: Perseus Jackson
Tartarus
Backbiter
The Battle Of the Labyrinth is the fourth book in the Percy Jackson series.
Just the first. It's actual name is "The Lighting Thief."
Percy Jackson and the Olympians, or the Sisters Grimm.