The Master has an enemy. While the Doctor may want to foil his schemes, this foe wants him dead. And this nemesis is the most dangerous man in the universe: himself!
While the future and past are dying, gaps appearing in time itself, the two of them are locked in a battle to the death. But how can the present kill the past? And can the past kill its own future? This battle has been a long time coming and its outcome may mean the end; not just for the Master, but for the entire universe.
When Big Finish gets it right it really gets it right. This is sit-down,-listen-and-wonder-
John Dorney has written a complex twisty tale that builds up on all the recent stories feeding into it. Rather than just paying lip service, they all incorporate elements that add to this tale- and while not essential pre-listening, they do provide additional rewards to those who have heard them. But even without that bonus feature this is a great stand alone story. Two Machiavellian devils playing against each other with Death the prize for the loser.