there are 15 bluford books. but now in 2011 there are now 18 bluford books so far.
There are four books in the books of Ember series.
There are 6 books. The first 5 are out right now but the 6th is coming sometime soon.
So far their are four: Found, Sent, Sabotaged, and Torn (the newest)
1. Fallen 2. Torment 3. Passion 4. Rapture Passion has just recently been published and rapture come out in spring 2012