In space, no one can fill your awkward silences for you... At the turn of the 23rd century, Liam Boyer's parents led the construction of the Empyrean Gate, an intergalactic spaceway that would make travel possible between Earth and Empyrean-an advanced civilization with the technology to fix Earth's environmental crisis. But when an extremist named Kin sabotages the Gate on opening day, he tears apart the two worlds-and Liam's family. In the three decades since then, Liam has dedicated his life to bringing Kin to justice and seeing the Gate rebuilt. Yona Kabul works on one of Earth's trash satellites, assigned to salvage and recycle anything she can from the landfill before it's fed to the sun to be disposed of forever. Just before her satellite's suncineration, Liam arrives in pursuit of Kin, who has come to dig up a long lost weapon with the intent of using it to destroy the Gate once and for all. When Yona is recruited to work with Liam, he has no intention of letting her slow him down. But the more she proves herself, the more he begins to see her value, in more ways than one. Soon they find themselves on a path with unpredictable twists, dangerous turns of the heart, and unimaginable stakes. Can they stop Kin before he shuts the door between the two worlds forever and dooms Earth to environmental disaster?