How many books are out in the secrets of immortal Nicholas Flamel?

There are six books in The Secrets of the Immortal Nicholas Flamel series by Michael Scott:

1. The Alchemyst (2007)

2. The Magician (2008)

3. The Sorceress (2009)

4. The Necromancer (2010)

5. The Warlock (2011)

6. The Enchantress (2012)