We have Deep Domain (Star Trek: The Original Series #33) by Howard Weinstein.
This novel has a heavy tune/theme of Voyage Home and the story line falls into the same timeline of the first four movies of Star Trek. Over all the story is great and is typical of most TOS novels. But there are a few plot holes and the characters were a little off. I had some problems with Kirk. It wasn’t your typical Kirk in this story, almost like the author didn’t know his history to well. But over all it’s a great book and i found myself over looking the problems that story had.
A routine diplomatic visit to the water-world of Akkalla becomes a nightmarish search for a missing Spock and Chekov, a search that plunges Admiral Kirk headlong into a corrupt government’s desperate struggle to retain power.
For both a Federation Science outpost and Akkalla’s valiant freedom fighters have begun uncovering the ancient secrets hidden beneath her tranquil oceans. Secrets whose exposure may even mean civil war for the people of Akkalla, and death for the crew of the Starship Enterprise.
If you find yourself with a copy of this book, read it! It works really well the theme that was set in the movies. Like STAR TREK: PROBE (Star Trek: The Original Series).