Cibola Burn: Book 4 of the Expanse [Book]

3. For generations, the solar system was humanity's great frontier. Until now. The alien artifact working through its program under the clouds of Venus has appeared in Uranus's orbit, where it has built a massive gate that leads to a starless dark. As the emissaries of the human race try to find whether the gate is an opportunity or a threat, the greatest danger is the one they brought with them. The gates have opened the way to new worlds and the rush to colonize has begun. Ilus, the first colony, is being born in blood and fire. Holden and his crew are sent to make peace in the midst of war. But the more he looks at it, the more he thinks the mission was meant to fail. 5. A thousand worlds have opened and a great land rush has begun. As colonists leave, the power structures of the old solar system begin to buckle. Private armies are formed. The sole remaining protomolecule sample is stolen. Terrorist attacks bring the inner planets to their knees. The sins of the past are returning to exact a terrible price. And as a new human order is struggling to be born, Holden and his crew must struggle to survive and get back home. 6. A group of Belters has crippled the Earth and begun a campaign of piracy among the outer planets. Outnumbered and outgunned, the embattled remnants of the old political powers call on the Rocinante for a desperate mission to reach Medina Station at the heart of the gate network. 7. In the vast space between Earth and Jupiter, the inner planets and the Belt have formed a tentative and uncertain alliance, still haunted by a history of wars and prejudices. On the lost colony world of Laconia, a hidden enemy has a new vision for all of humanity - and the power to enforce it.