Here we have another interesting concept that just does not work. Growing up Planet of Evil was one the few stories I did not see much of. This lead me to not understanding why some people regard it as a classic. In reading the novelization, I'm still not impressed.
As I mentioned it does have an interesting concept. It could be described as Jekyll and Hyde in space. You might laugh at that concept, but it could be held true.
The story involves The Doctor and Sarah, Harry did not carry on with them after Terror of the Zygons, receiving an emergency distress call. From here we have back and forth between the TARDIS, the planet, and a rescue ship. It seems to go back and forth on where things are heading.
I think with the actions takes place, my thoughts are they had an idea that worked on paper, but the execution turned out not quite right. In addition to the Jekyll and Hyde case with a professor, there is also an issue with matter/anti-matter problem, and the home planet needing more energy resources. Oh, and almost forget the Doctor and Sarah being accused of murder.
As far as the writing goes, it is bellow the Target average. We get the story across, but not much else. If you enjoyed the story on TV you probably will enjoy the book. If you did not enjoy the story, you can skip this one.