The Scorch Trials (The Maze Runner series: Book 2)

She spoke to him before the world fell apart.
Hey, are you still asleep?
Thomas shifted in his bed, felt a darkness around him like air turned solid, pressing in. At first he panicked; his eyes snapped open as he imagined himself back in the Box – that horrible cube of cold metal that had delivered him to the Glade and the Maze. But there was a faint light, and lumps of dim shadow gradually emerged throughout the huge room. Bunk beds. Dressers. The soft breaths and gurgly snores of boys deep in slumber.
Relief filled him. He was safe now, rescued and delivered to this dormitory. No more worries. No more Grievers. No more death.
Tom?
A voice in his head. A girl’s. Not audible, not visible. But he heard it all the same, though he could never have explained to anyone how it worked.