Hemlock Lake is a quaint little town. But it is autumn, and this tiny summering community is eerily quiet except for 9 year old Angie Appleton, riding her bicycle down the empty rural road and up the driveway of a picturesque lakeside cottage, a 'Sold' sign on the front lawn. The Appletons have just moved in.
Jack and Liz have moved to Hemlock Lake for a fresh start. That's what Liz is hoping for, she wants to keep the family together. Jack will do anything for her, but he knows when things have gone too far. Liz suffers from blinding migraines that cause her to black out and "see things". She tries to control it with sheer willpower but more often than not, with medication.
As night falls, Liz starts to have more frequent episodes. She is seeing things outside, but are they real? Late in the evening, a knock comes at the door. The stranger introduces himself as Geoffrey, a neighbor, with a desire to come in to see what they have "done to the place" and is obviously smitten with Liz. Jack suspiciously sends him on his way as Liz sinks deeper into a sense of dread and the purgatory between fantasy and reality.
When Jack realizes that Liz hasn't been imagining things, and that they are being stalked, Jack and Liz must prevent the intruders from getting the one thing they want...little Angie Appleton.