This is one of 12 books that adapt the original Star Trek TV episodes from 1966 to 1968. James Blish wrote these adaptations in the late 1960's and early 1970's and they have been re-released multiple times since then. In some cases Blish was not even using the final televised script, but basing the stories on earlier versions provided to him by Paramount. This impacts the quality of the adaptations, especially in the early books. In addition, reading these is somewhat like reading a Condensed Book, (There are 6 to 10 episodes per book).
Another challenge for those expecting accurate adaptations is that in those days, continuity was not a high priority, especially among Licencing people. Today, Star Treks fans and casual readers alike, would express outrage at such inconsistencies, and Paramount's licencing department would be alot more concerned about top quality. So remember, these books came out almost 30 years ago.
I read them the first time around, and over the years have reread specific episodes when the situation arose. I was never totally satisfied, but resigned myself to the fact that they were all that was available. Today, I find them lacking even more. After reading recent adaptations, for example, the Next Generation's TV episode "Unification", or even earlier ones such as Alan Dean Foster's work on the Logs, I am a firm believer that detailed, accuate, and well-written adaptations of the TV episodes can be written that would be satifactory to the fans.
The big question is "if?". The chances are slim to none that we will ever see new adaptations. The economics just are not there. Bantam, (nor any other publisher for that matter), would not undertake such a thing when they can just re-release these every few years. In addition, with the interest in classic Trek having peaked a couple of years back, along with the proliferation of so many new novels, the sales potential is just NOT there.
Therefore, if you want to read novelized versions of the original TV episodes, then BUY THESE and ENJOY. But keep dreaming "What if?".