In the epic finale to the saga, Thomas leads his group of escaped Gladers on their final and most dangerous mission yet. To save their friends, they must break into the legendary Last City, a WCKD-controlled labyrinth that may turn out to be the deadliest maze of all. Anyone who makes it out alive will get answers to the questions the Gladers have been asking since they first arrived in the maze.

With the gang spread across the country (and beyond) at college, Spencer is back to feeling out of place, even when he returns home over winter break. Desperate to escape his grandfather who is sharing his room, and to feel confident again, he attempts to fix the broken Jumanji video game, giving his friends no choice but to level up and return to rescue him.