An excellent new addition to The Expanse series. I'm giving it 4 stars rather than 5 because the first third or so of the book was a bit of a slog. Other than the main characters (Holden, Naomi, Alex, and Amos), EVERYONE in the book is new. It drags on the reader to have to learn from scratch all the various players, motivations, and politics, not to mention the ships and their capabilities and who's got the biggest guns. 
 But once the story picks up, it just never stops. The premise takes the series into a new direction that I think will be fascinating. Once the actiongets going, Abaddon's Gate really delivers. Well worth the time and effort -- can't wait for #4.