The stars have fallen, and the world is tilting into darkness.

"From dust you came, to ash you go." - These terrifying words are found spray-painted on an office wall in Tucson. It is a message left by Legion, an otherworldly entity that traveled to Earth in the fallen stars. Now Legion is enveloping the world in darkness, disintegrating almost everything in its path and leaving nothing to stand in its way of the planet's destruction.

Nathan Pierce is on the run for forging the president's mandatory barcode tattoo. With a bounty on his head, Nathan finds an unexpected ally in Cynthia Ruin, who agrees to help him save his sister, Daisy, from being executed for treason. But Cynthia's mother, Theresa, is the one who betrayed Nathan and Daisy. Surrounded by suspicion and doubt, Nathan struggles to stay one step ahead of the world that's against him, and keep tabs on Cynthia, who may or may not end up selling him out in the end.

In the midst of the darkness, those still alive are forced to fight against Legion's malevolence or lose their humanity beneath it.