When Class 1-A is suddenly transported from U.A. High into the world of the Glade, they find themselves trapped in a deadly maze with no way home, no adults, and no answers. Y/N, a long-time Glader and Keeper of the Med-Jacks, is one of the first to step in and help the newcomers adjust to survival in the Glade. As tensions rise between the Gladers and the heroes-in-training, she becomes a key bridge between the two groups. But in a place ruled by shifting walls and monsters in the dark, survival is only the beginning… and escape may not be as simple as anyone hopes.