Yes.
The Mark of Athena.
The mark of Athena
The third book of The Heroes of Olympus series by Rick Riordan, titled The Mark of Athena has not yet been released.
The book after "The Mark of Athena" is "The House of Hades," which is the fourth book in Rick Riordan's "Heroes of Olympus" series.
The Mark of Athena which came out on October 2, 2012
No, Percy Jackson and the Lightning Thief was in the first series and Heroes of Olympus is the second series (Lost Hero, Son of Neptune, Mark of Athena) Hope this helps :)
He is writing The Mark of Athena, the third book in the Heroes of Olympus series.
No, "The Mark of Athena" is the third book in "The Heroes of Olympus" series by Rick Riordan. The series continues with "The House of Hades" and "The Blood of Olympus," which are also set in the world of Camp Half-Blood.
"The House of Hades" is the fourth book in the Heroes of Olympus series by Rick Riordan and it was released on October 8, 2013.
the third will be the mark of athena (fall 2012), and the fourth is undecided.
Blood Of Olympus is the name of the 5th and rumored final book to the series of "The Heroes Of Olympus"
The third book in the series will be named The Mark of Athena and it will come out October 2, 2012.