If you were a fan of The Maze Runner series by James Dashner you will certainly want to check out the prequel to the series, The Kill Order.
Take a look at the first five chapters of The Kill Order:
If you never read the Maze Runner books, you should give them a chance. The action-packed and adventurous story follows Thomas as he wakes up in a mysterious elevator, and the only thing he can remember is his first name. His memory is gone, but he’s not alone. When the elevator doors open, Thomas finds himself surrounded by other kids who welcome him to the “Glade”: a massive, open community enclosed by stone walls. Like Thomas, the “Gladers” have no memory of how they got to the “Glade.”
All they know is that each morning the stone walls open, revealing an intricate the maze outside of the “Glade.” And every night the walls close.
Thomas and the “Gladers” work to discover why they are in the “Glade,” and what’s outside in the maze.