He is famous for his tetralogy
The Age of Unreason, a
steampunk/alchemical story featuring
Benjamin Franklin and
Isaac Newton. He wrote the
Babylon 5 Psi Corps trilogy, a history of the Psi Corps and a biography of Psi Corps member
Alfred Bester. In 2003 he began a fantasy series titled
The Kingdoms of Thorn and Bone, the first volume of which was
The Briar King. The second book in the series
The Charnel Prince was published in 2004 and the third,
The Blood Knight, was published in July 2006. His fourth and final book of the quartet,
The Born Queen, was released in March 2008. In 2009 it was announced that Keyes would be writing two novels based on the successful computer game
The Elder Scrolls IV: Oblivion. The first of these,
The Infernal City, was published by
Random House in November 2009. The second,
Lord of Souls, went on sale on September 27, 2011. ==Style==