"Four decades after the Oblivion Crisis, Tamriel is threatened anew by an ancient and all-consuming evil. It is Umbriel, a floating city that casts a terrifying shadow; for wherever it falls, people die and rise again. And it is in Umbriel's shadow that a great adventure begins, and a group of unlikely heroes meet"--Publisher.

Based on the computer game: The elder scrolls IV, Oblivion.