It's midnight as Katie Karr and her new friend, Tyler, pedal their bikes through the dark streets of Golden Falls. They are on their way to explore Stockwell Mansion - an abandoned Victorian-era mansion set on a hilltop above the town.Katie, new in town, is fascinated by the old mansion, and though she's been told to stay away, she is determined to find the source of a mysterious light she's seen shining from the heights of the "mansion on the hill."Sneaking into the mansion, Katie and Tyler explore each room, each dark corner, and discover more than they ever expected.