This is one of the best Star Trek books I've ever read, and I've read many. It is action-oriented, but has plenty going on behind the action for those who don't read Star Trek purely for action. I'm not generally a fan of Klingons, although I'm finally beginning to accept them as protagonists, so if I speak highly of this book, understand that that's an extremely high recommendation; it isn't as though it's coming from somebody who loves any book focusing on Klingons and their culture.If you're a fan of Klingons, this one can't miss. If you're a Kirk fan, you'll love it. One could quibble, and suggest that the relationship between Kirk and the Klingon commander is too congenial for the time period in which the book is set, but that would be an EXTREMELY picky quibble.