The Merlin of Mortlake: The Life and Talents of Dr John Dee

 was a book written by Evelyn Smythe. It was a biography of John Dee, whom Evelyn had met while travelling with the Sixth Doctor.

The Doctor obtained a copy of the book, before Evelyn had written it, and had her autograph it. However, he refused to allow her to take a peek at it. (PROSE: Mortlake)