Expanse, The: Dragon Tooth #4

The first lore-expanding arc of the Kickstarter sensation comes to an explosive close!
Working together, Avasarala and Drummer piece together the true nature of the mysterious “Dragon Tooth"
The Rocinante joins a battle group of OPA pirate-hunters for a final showdown with the notorious pirate Sohiro, but they get more than they bargained for!
But it’s up to The Rocinante and its crew to secure the alien Ring Gates—and the future of the human race…