When is the book after the হারিয়ে গেছে hero!

If দ্বারা that আপনি mean when does the পরবর্তি 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 তারিখ as of right now.

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