"They call us Arbiters. We arbitrate conflict to keep the peace." In 2853, humanity has established a presence across the solar system. Linked by a network of FTL gateways called Boson Apertures, travel between the 7 colonized worlds and thousands of space colonies takes only hours. The Sol Federation is the final authority, and the Arbiters travel the system to maintain order. Arbiters Gabriel Anderson and Tycho Barrett have just been sent to intervene in a growing crisis on Venus. Information is limited, but they know two things: Tower 7 has gone completely dark, and security androids are killing civilians. No one knows what has become of the tower's 520,000 residents or who is responsible for the mysterious assault, but the priority of the mission is clear. Tycho and Gabriel must breach the tower, investigate the missing civilians, and locate the one responsible... all while trying to stay alive.