The Elder Scrolls Novel

Forty years after the Oblivion crisis, the empire of Tamriel is threatened by a mysterious floating city, Umbriel, whose shadow spawns a terrifying undead army.
Reeling from a devastating discovery, Prince Attrebus continues on his seemingly doomed quest to obtain a magic sword that holds the key to destroying the deadly invaders. Meanwhile, in the Imperial City, the spy Colin finds evidence of betrayal at the heart of the empire--if his own heart doesn't betray him first. And Annaig, trapped in Umbriel itself, has become a slave to its dark lord and his insatiable hunger for souls.
How can these three unlikely heroes save Tamriel when they cannot even save themselves?
"Based on the award-winning Elder Scrolls"(R) "series, "Lord of Souls" is the second of two exhilarating novels that continue the story from The Elder Scrolls IV: Oblivion, named 2006 Game of the Year by numerous outlets, including Spike TV, the Golden Joystick Awards, and the Associated Press."