Minotaur Books and Edelweiss let me read this book for review (thank you). It will be published on November 10th.
It's a bit of a challenge to keep the various tribes segregated and figure out how to ask the questions in a form that will get an answer,
Jim talks to everyone in the vicinity but knows he's not getting what he needs. He ends up travelling to find some of the witnesses. When he gets beat up, he figures he must be getting close.
While all this is going on, he finds himself falling in love with one of the sisters. He's not suitable as a husband for her, though. But she's no shrinking violet either and also loves him.
He does ferret out who the killer was but he almost loses his life in the process.
This is a long drawn out investigation but it's interesting. And it even has a happy ending.