The Demon Cycle is a series of books written by author Peter V. Brett. Also, as of February 10, 2015, it is a 3-book Kindle bundle (the first 3 books). The series according to Peter V Brett blog, will include 5 main books, going by these titles:
- Book 1 - The Painted Man / The Warded Man (2008) 
- Book 2 - The Desert Spear (2010)
- Book 3 - The Daylight War (2013)
- Book 4 - The Skull Throne (2015)
- Book 5 - The Core (2016?)
But, he has also stated there will be 1 or more other Novels that tie into the Thesan world. So far, only one of these has been announced officially.
- Book 6 - Tibbets Brook[Citation needed] (Working Title)
These are not officially part of the main storyline, but were too long to be considered novellas, and also paint an interesting picture into the lore of the Thesan world.
Brett has also announced and released a few Novellas already, So far there are 2, with a third on the way. But, according to Bretts blog there are several more planned. So far these are.
- Amazon The Demon Cycle 3-Book Bundle: The Warded Man, The Desert Spear, The Daylight War Kindle Edition by Peter V. Brett (Author)