||The book that I have is lists Present Tense as Book One of Three. And the since the way it ended was definitely set up for a continuation, I will say this is the 1st of a three books series.
I liked this book. This takes place right after "The Naked Time." It has a brand new ensign Chekov on the Enterprise. It goes through some revisiting previous TOS things, which I always enjoy. Continuity I thought was a little lacking in the TOS series and the books seem to pick up the slack. Also, it has Uhura being the senior officer of a trapped landing party. Not to mention they reference "The Bermuda Triangle"; another favorite of mine. This has some interesting gadgets and ideas; though towards the end, it seemed like it was heading too much into different directions, so, that's why I gave it 4 instead of 5. Seemed to try to build up to too much, and not sure which way it was going. But it definitely sets you up for the next installment. You will not be disappointed. I am looking for the 2d book now.