A bit of a weird one this one really, is the first Seventh Doctor story (and a poor way for the Sixth to have to go out really, with his end portrayed here), and brings back the Rani who is an interesting character, but whose motivations / plans here seem more in line with what the Master would try, than really in character for the Rani, against how she was portrayed in her first story, and no regeneration to help explain such a change.
The story itself has some interesting twists with the interactions between the Rani, the Doctor and Mel, but outside of that is a bit run of the mill, and the nature of the twists means it is a bit harder to get a good grasp on the Seventh Doctor at this point.
Mel is in reasonable form here though, and overall is still a reasonable read, if nothing amazing :)