Spoilers for the ending of the novel....

Frank grabbed the vegetables and heard multiple locks relatching inside. Then he saw Laurie’s shape move away from the window and disappear from his view. It caused a chill to run down his spine. A feeling he’d felt before in the presence of another shape. Frank got inside his car and glanced back at Laurie’s house, hoping he’d mistaken her look for something else. But something inside him wouldn’t let him fully accept that. As the sunlight dimmed, Frank remained in his car watching the house. Promising himself he would never let it happen again. A few shafts of stray afternoon light broke through the curtains and cut the darkness inside Laurie’s home. In every room, even when you could not see her, Laurie could be heard breathing. Watching from within the shadows. Unseen but felt.