If you watched the two-parter episode of "Unification" then you pretty much have an idea of what's going on here. However, it being a novelization there's a bit more to expand upon. Highlights include:
The Klingon Captain, K'Vada, who transported Picard and Data to Romulus fantasizing about banging his wife again over and over and over, whilst simultaneously complaining about/enjoying the dislocated shoulder he received the last time they did.
The Admiral who gave Picard the briefing having a giddy school-girl crush on him (which methinks was the voice of the author herself).
The fact that not only is Romulan society oppressive in the extreme with the poor being kept deliberately poor, it seems, but Romulan soldiers routinely enter the poor districts and senselessly murder people, including children. I never really got that from the show - an oppressive society, sure, but not a murderously savage one. It makes one wonder why Picard was always interested in establishing a peaceful dialogue with people such as that.
Amarie (the four-armed piano player) being quite a bit of horndog. She refers to her ability to be quite "bouncy" in a sexual context more than a few times, especially when comparing her full-figured self to the waifish women who accompany the Ferengi arms dealer...although, apparently she and he end up together. Also, her perception of her physical appearance versus Riker's perception is an interesting juxtaposition. Riker's kind of a judgmental asshole.
Additionally, Riker wants to bang an Ensign in Security who accompanies him just about everywhere in this novel - I don't remember that from this episode. But also keeps reminding himself that he's a professional and shouldn't be banging subordinates, although I'm pretty sure there were more than a few times in the show when we see him dating and/or entering/leaving the room of a female subordinate. Of course, this one doesn't return his affection, although he constantly thinks she does, until he doesn't...but then he suggests that she gets a hobby, and Troi talks her through some trauma in her past or something and also suggests that she gets a hobby...and then her and Riker are planning on having dinner together later after the show, uh, I mean novel, so yah - he's gonna bang her.
Overall, this is a pretty sexually-charged up novel. Although, the more Star Trek novels I read, the more sexual tension I seem to find...almost like a young teenaged boy wrote them. Perrin, Sarek's second wife, even starts making eyes at Picard when he sympathizes and empathizes with her. I'm sure, if Sarek had already passed by the time they encountered each other, she'd be climbing up on top of him, too.
If you liked the episode, I'd recommend the book. It does fill in some nice holes here and there (pun intended). However, Qualor Two's place in the Federation seems incongruent. It's the site of a Federation surplus ship yard, and apparently, Riker has the authority to revoke the Ferengi's "passport," and the Zakdorn are members of the Federation...who apparently live on Qualor Two...I guess, why bother using their own planet name...seemingly indicating that they've been conquered/colonized...but that's neither here nor there. My point is, there seems to be the need for money on Qualor Two, as Amarie lives paycheck to paycheck and worries about losing her job, etc., etc...but the Federation doesn't use money, so...um...hmm...