A lot of Star Trek novels seem to be about, or use, Data as the main character. Perhaps it's because they can write Data as growing during the story, or they like having a character that is nearly always correct even if he's not always right.
The plot of the book isn't anything special. The computer of the Enterprise gets 'confused' (takes readings of an unknown phenomenon) and the crew (and Spot, Data's cat) find a dying civilization in the middle of a Nebula like thing. Of course, there is political turmoil and the Enterprise crew is never quite trusted entirely.
The plot is nothing new or different, but my favorite parts were the stuff with Data's cat Spot. The author has a very good grasp of how cat's exist, act, and it came off hilarious in the novel.
It's a quick, light, and easy read. Nothing stupendous, but I've read many other Star Trek Novels that were much, much, much, much, much worse written. A solid three star book.