Arriving on a desolate planet, the (Second) Doctor, Jamie and Zoe are surprised to find it inhabited by a human-like race, called the Gonds. However, something very strange is going on on this world. A mysterious people, called the Krotons, are apparently selecting the most intelligent of the Gonds, and after some experimentation, killing them. It is up to the Doctor to figure out what is happening and why, and save the Gonds. But first, he's going to have to keep himself and his companions alive!
This book is a novelization of a very good Patrick Troughton story that first aired December 28, 1968 to January 18, 1969, and was composed of four episodes. As a novel, the result was pretty good. It's a bit slow-moving, as far as sci-fi goes, and seems to lack the rush and fear of the television show. Nonetheless, I did enjoy the story, and am quite glad that I read it!