I'm wee-bit confused here. To me, behind the scenes books are those such as Inside Star Trek, Star Trek Memories, Star Trek Movie Memories, I Am Spock, etc. However, someone mentioned the Star Trek Sketch Book (which is good) and the Making Of Star Trek (very interesting) - which, in my opinion, are reference books; as the mentioned Compendium. Or, we good just go with non-fiction as the category . . .
Personally, I enjoyed all those mentioned above, but the first non-fiction book I'd grab on the way out the door, en route to that desert island, would be the Concordance.