The Western. First colony world on the far side of the gates, two groups with competing claims, and no functioning law to settle it.
This is the one readers tend to rank lowest and I understand why. After the scope of Abaddon’s Gate, a land dispute feels like a step down. What it is actually doing is showing what happens when a frontier opens, which is that people arrive long before institutions do.
Read July 2023, straight after book three.