They are holding the Vegas end responsible for recovering the money or making good on it. The Vegas guy calls in Karch to make things right. Karch goes after Cassie. He doesn't give up. We learn a little more.
More people die.
We learn a lot more. Then it is all over and we know everything, but we have this sense of unsettled resolution, even though the actual story line is tied up at the end like an Eagle Scout's best knot. The ending is the best that could be hoped for, considering the forty-seven things that go wrong, but it's still predictable, in that flat sort of way, when you're pleased you figured it out, yet disappointed it was so easy. Still, this may be the one book by Connelly I'll probably reread. Take that however you want.