Last night I finished re-reading Babylon's Ashes, I was initially pretty disappointed when I heard they were stopping The Expanse TV series there, but upon reflection I think it is a pretty decent spot to wrap up. It pretty much results in the functional end of the Earth/Mars/Belt paradigm that drives most of the series' drama and politics, and in that respect I think if forms a good "ending" to the story, albeit one that leaves some major unanswered mysteries behind.