A thrilling dystopian science fiction novel by James Dashner and the fourth published book (and prequel) in the The Maze Runner series. Set thirteen years before the events of The Maze Runner, it reveals how the world collapsed and how the deadly Flare virus began.

The story follows Mark and his close friend Trina, survivors of catastrophic solar flares that devastated Earth. They have managed to build a fragile new life in a remote settlement alongside other survivors. Their hope is shattered when mysterious aircraft attack the community, releasing darts that infect people with a terrifying disease known as the Flare.

As the infection spreads, victims descend into madness and extreme violence. Mark, Trina, and a small group of survivors embark on a dangerous journey across the ruined landscape to uncover who is responsible for the attacks and whether humanity has any chance of survival. Along the way, they confront ruthless enemies, impossible moral choices, and the horrifying origins of the virus that will later shape the Maze Runner saga.

Packed with relentless action, suspense, and emotional stakes, The Kill Order expands the series' lore while exploring themes of survival, sacrifice, friendship, and the ethical consequences of scientific experimentation.