In the orbit of Uranus, a giant, miraculous formation in the shape of a ring suddenly appears, which attracts everyone's attention. However, curiosity gives way to real panic when a spaceship disappears without a trace in the mysterious Ring. Where did he go? What caused this anomaly? And what really lies on the other side of these hellish gates? Scientists, journalists and military personnel from Earth and Mars head to the Ringworld to investigate the mysterious object. Among the other ships of this vast flotilla is the Rocinante, under the command of James Holden. While emissaries of the human race try to determine whether the Ring opens up new opportunities or poses a threat, Holden must face a much greater danger...