The Abbot gasped. "What do you mean? How could he have destroyed Gallifrey?"
Due to the manipulations of Fenric, the space-time vortex has collapsed, and the Doctor and Grace have had to save the universe from destruction. But, as this has been happening, a great evil eons older than the universe itself has escaped from its prison in the vortex. It is known as "the Dark One".
Now the Dark One's legions are raging across all of time and space in a brutal war of annihilation, and all that stands against him are three Time Lords: the Doctor, the Abbot, and the Master. This launches the three of them into an adventure where they will have to face not their worst nightmares and demons.
And beyond that, death itself...
This is another round-robin story featuring the 8th Doctor and Wil.