A group of friends investigate the mystery of a strange staircase in the woods in this mesmerizing horror novel from the New York Times bestselling author of The Book of Accidents

Five high school friends, bonded by an oath to protect each other no matter what.

Then, on a camping trip in the middle of the forest, they find something extraordinary: a mysterious staircase to nowhere.

One friend walks up—and never comes back down. And the staircase disappears.

Twenty years later, the staircase has reappeared. Now the friends return to find the lost boy—and what lies beyond the staircase in the woods…