The sequel to The Shining. And yes, you need to read The Shining first to appreciate Danny’s past. Danny was the kid, and in this book, he’s grown up. But he has not forgotten the horrific events that led to the death of his father. In fact, he’s grown up to be a druggie, so he can blot out those memories. And his mental powers are pretty much forgotten.
He does manage to find his way back to sobriety, and is starting to lead a productive life. That leads to why he’s nicknamed “Dr. Sleep.”
Danny’s troubles are not over, however, as he gets drawn into a battle with a hellish cult. Can Danny’s powers same him again?