The Shadowmarch Tetrology
Originally a trilogy, Tad Williams announced in late 2009 that there would be a fourth installment to the series. The given reason was that the third book had become too long to wrap up.
- Shadowmarch, November 2004.
- Shadowplay, March 2007.
- Shadowrise, March 2010.
- Shadowheart, November 30, 2010.
Read more about this topic: Shadowplay