If you're going to do a book about a television series then this is the way to do it. The author starts with a context for the One Step Beyond television show. What was going on in our society at the time? What other types of shows were on? He then goes into how the series was started.
For each episode the author gives the title, cast members, a short synopsis and a commentary. That part discusses what happened in the episode (the good and the bad), what the actors and actresses may have gone on to perform in (such as X-Files and Star Trek episodes), and how the content of that episode related to episodes of later shows.
The commentaries are complete and very well done. He then goes on to do with same thing with The Next Step Beyond (a sort of very poor continuation of One Step Beyond). The book even includes appendices with a very valuable one examining the type of psychic trait and what episodes that trait appeared in. There are four more appendices, notes and even a bibliography. If you have any interest in the series this is a must-have.