The Expanse: Dragon Tooth #6

Two years after the Free Navy asteroid bombardment, Earth's ecosystem is crippled. Mars is reeling from the exodus of its citizens to colonies beyond the ring gates, and the defection of officers to separatists led by a treasonous admiral. The Transport Union controls all transit and trade through the ring space from Medina Station. But transports heading to the ring are falling prey to a pirate faction, led by the elusive Sohiro, with no navy, the Transport Union must rely on contractors to provide security in the expanse beyond the belt...