A group of friends investigates 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.
 
"Chuck Wendig weaves his magic once more, turning a lonely staircase in the woods into a searing, propulsive, dread-filled exploration of the horrors of knowing and being known."--Kiersten White, author of Hide and Lucy Undying
 
Five high school friends are bonded by an oath to protect one another 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. Then the staircase disappears. 
 
Twenty years later, the staircase has reappeared. Now the group returns to find the lost boy--and what lies beyond the staircase in the woods. . . .