Doctor Who: A Broken War

Takes place after The Day of The Doctor and Gallifrey is saved. But the War Doctor still can't accept himself as the Doctor, and stops his regeneration. Not only is he being challenged with these thoughts but an old foe threatens the planet he swore to defend and has done so for centuries. Will he allow himself to change or will he simply fade away into darkness, being nothing more than a story? Can he stop his foe and save Earth from destruction?