72) Steve Lyons — Doctor Who: The Stealers of Dreams
Sixth of the tie-in novels for New Who, and the last to feature the Ninth Doctor (and thus also pre-immortality Jack). Nine, Rose and Jack find that their latest stop is a world where fiction is outlawed, and those who indulge in it are regarded as having a dangerous drug addiction that must be treated, by force if necessary. Naturally, the Tardis crew end up interfering. But it gradually becomes clear that on this world dreams really are dangerous, and the Doctor’s usual tactics may be more harmful than helpful.
Good writing, nifty concept, a solid plot, and some excellent secondary characters, with a nice twist at the end. And the monster isn’t overly familiar from tv episodes before or since, which is a problem I’ve occasionally had with coming to the books relatively late.