I very much enjoyed the series of books, Star Trek: The Fall (the Star Trek "events" have been consistently good since the "Destiny" series, whereas before that they were very much more patchy in quality) and Dayton Ward's closing book was no exception.
***WARNING, SLIGHT SPOILER ALERT***
However, since the main antagonist is a religious Bajoran, why didn't Riker, Picard, Akaar et al, simply contact Sisko and work a bluff? During his years as the recognised "Emissary of The Prophets" and his years in "The Celestial Temple", it wouldn't be unreasonable for a Bajoran to believe that Sisko might have picked up certain information. Come to that, Starfleet acceptance of "The Wormhole Aliens" existing in non-linear time ought to have drawn them to take Sisko into their confidence anyway (as well as bringing Garak into the plot at a much earlier stage; not to mention Odo, now he's stuck in the Alpha quadrant).
These small niggles aside, I found the book to be very enjoyable and would recommend the series, if perhaps not the book individually.