Well, I wonder what caused this. This is huge! Well, not literally huge. Slightly smaller than usual. Which is huge.
From the early 1970s to the early 1990s almost every television adventure was novelised by Target books, the paperback division of WH Allen, and later an imprint of Virgin Publishing. Early adventures were stand alone novels, sometimes with new companions in the story, but later on they became novelisations of the story.
Twice Upon A Time by Paul Cornell
Number of Pages: 161