A good expansion of the story as seen in the film, with lots of informative (and often amusing) footnotes by Roddenberry addressing this or that aspect of the Star Trek universe (even to the point of addressing K/S slashfic writers). Quite enjoyable, and in some ways, better than the film (and I'm one of that minority of Trek fandom who actually likes _The Motion Picture_) due to the expanded scenes and better pacing.