This is a novelization of one of the First Doctor’s entirely missing serials (at least at the time of this review). It’s one of the “historical” stories, with the Doctor, Susan, Ian, and Barbara. The crew are stranded on the roof of the world when Marco Polo comes upon them and rescues them—but for a price: he wants to give the TARDIS to Kublai Khan as a gift because a “flying caravan” will make him the most powerful ruler in the world. Naturally the Doctor and crew don’t want that. And meanwhile, the war lord Tegana is also interested in keeping the TARDIS for himself. From what I’ve read online, the novelization differs in some ways from the original story, most notably in the ending, but I liked the book ending better. Overall this is a good retelling. ( )