I read this shortly after having watched the Doctor Who episode of the same name, and I can't really separate the two in my memory.What does stick in my memory is the way that the two completely different characters (Martha and Benny) skew the vision. And that the novel has a lot more violence and death than I remember in the episode. And that I hope interesting things have been said about perceptions of race, and how stories set in historical settings explore this (Martha is black, Benny presumably white)