My group is about to start their first AP and they have asked me, as the GM, to choose the best ones from the 15 available, then they will vote on which one we will run.
We have been playing only 30 pages paizo modules so far, so i feel that my players have never experienced the joy of a rich overarching plot that connects all the single adventures into a memorable story.
So my question is: Which AP has the best story that connects (almost) everything through the six books?
To clarify i'll add that while i was reading the AP general discussion forum i often encountered the phrases: "I think that [AP NAME] is very disjointed betweek books." and "in this book of [AP NAME] the PCs don't progress at all with the main plot"; if these phrases can be used to describe an AP, then that particular AP is the exact opposite of what i'm looking for.
Bonus points if the AP has some fully fleshed-out NPCs, not necessarily many NPCs, i would be happy even with 4-5 if they're as precisely described as possible.
I understand that what I'm asking is highly subjective and the the mileage may vary a lot between group and group, so personal opinions are obviously welcome.