I loved this book, but one thing I will say: we watched "Field of Fire" the other night -- an episode I don't much care for in the first place -- and it's pretty hard to square that depiction of Joran (and Ezri's relationship with him) with the events of this book. To be clear I far prefer the take in the book but while this novel really fleshes out the Jadzia/Trill episodes I'm not sure it's quite consistent with the Ezri/Trill episode.
I wasn't sure how much of my mental image of Joran came from the actual episodes versus the Lives of Dax story, so I largely gave the novel the benefit of the doubt in fleshing him out in a way contrary to what I expected. I do remember some disagreement in different stories about whether Joran Belar was an okay guy before he was joined and the combination with Dax just made Joran Dax violent and amoral, or if Joran was alway a murderer and conned his way into being joined. This novel seemed to split the difference between those two readings, though his killings ended up feeling a bit too justifiable (and more of a "spree" than a "serial killer").
Maybe I missed something, but why would they implant a cloned symbiont into a human, Colin Hart, when there were apparently so many initiate washouts to choose from? Just to get somebody close so they could attack Dax? Being in Starfleet doesn't seem to have aided Hart in that. And why was it apparently unfinished as he had an open wound from the procedure? They never say it was a Vess but I imagine it had to be.
Yep. Hart was kidnapped and implanted in a rush job so Vess could get the drop on Dax and assassinate her, and was regarded as disposable by Vess.
I liked the story for the most part, and it was a clever and dark twist. But I have to say, having all the evil symbionts be clones controlled by a single primary symbiont felt kind of like the cliched copout of having all the weapons/invading aliens/monsters be slaved to a single control, so you can take them all out just by defeating one. (There was a DS9 episode that did that with a grid of Cardassian or Dominion defense satellites, and The Avengers did it with the Chitauri.)
I thought it was only really contrived that Jadzia's friend was the "head vampire," and they all just seemed to assume that was the case, and I don't believe there was a reason given why she would've gotten the original Vess.