Timewyrm: Exodus

In 1991, Timewyrm: Exodus was released by BBC Books.

Cover blurb
The pursuit of the Timewyrm leads the Doctor and Ace to London, 1951, and the Festival of Britain — a celebration of the achievements of this small country, this insignificant corner of the glorious Thousand Year Reich.

Someone — or something — has been interfering with the time lines, and in order to investigate, the Doctor travels further back in time to the very dawn of the Nazi evil. In the heart of the Germany of the Third Reich, he finds that this little band of thugs and misfits did not take over half the world unaided.

History must be restored to its proper course, and in his attempt to repair the time lines, the Doctor faces the most terrible dilemma he has ever known...

''Terrance Dicks has written many novels based on Doctor Who television stories, and was script editor of the series for five years. Timewyrm: Exodus is the second adventure in the Timewyrm series.''