Enemy Within the Skull (Cap Kennedy 4)

Cap Kennedy and his gang goes from Terra to a prison planet and then to confront an evil scientist.
The beginning of this novel is more investigation centered and then it turn to full action narrative.
I enjoyed the book and in my opinion is an improvment comparing with the three previous books.
BUT
Don't get me wrong, with 120 pages long, nowadays considered a novella, this book is just what he was written for. A quick reading material. Don't expect anything more than that.