NEW YORK TIMES BESTSELLER - The #1 bestselling author of The Island is back with another pulse-pounding, twisty read! Haunted by the past . . . terrified of the present. Penny knows she must forget about her ex, Nash. Ever since his father was revealed as the brutal serial killer who traumatized their small town last Halloween, Penny's parents have forbidden her to have anything to do with Nash or his family. It's hard not to think of him--but she's trying. That stops when she goes shopping with friends for a costume. What she finds instead is ripped from a horror movie: someone from school bleeding out on the floor of a dressing room. Stabbed. People are quick to blame Nash and his sister, Grace, but as Halloween nears and the body count rises, Penny can't help thinking this copycat killer is someone no one else suspects. . . .