When is the book after the लॉस्ट hero!

If द्वारा that आप mean when does the अगला book come out then the Son of Neptune, last I heard, is coming out on October 4th, 2011.
Could be wrong but I'm pretty sure that's the release तारीख, दिनांक as of right now.

And if that's not what आप meant then...I got nothing.