When 16-year-old Annie Tuttle takes a walk at her lakefront home, she spots a young girl standing on the ice-covered lake. As Lucy falls through the ice, Annie hurries to rescue her and sees a figure at the center of the lake; the figure seems to shimmer and disappear before her eyes.

Nine years later Annie is happily married to Jack Cole. Annie gets a letter which reads: “It’s going to kill you. Come alone”. The letter leads her to the Granger Institute and Lucy Talbot - the girl from the lake. Lucy explains that the GLIMMER will never let her live.

Outside Annie meets up with Gabe, the local deputy and a former boyfriend. In Lucy’s room Annie and Gabe discover two pictures and a page torn from a book dating back to 1698; in them the figure of Eldridge Peck appears, a man executed for being a witch. Meanwhile Annie has discovered a link between the Peck family and her husband, Jack.

Annie must race against time to save herself and her unborn child from the GLIMMER.