New student Lizzy Walker is the talk of Shadyside High. Michael and his girlfriend Pepper befriend her, but the closer they get to her, the stranger she seems… and the more attractive she is to Michael. He invites her to join him on a snowmobile race that ends in a tragic accident. Soon, Michael's friends start being murdered, and Pepper becomes convinced that Lizzy is behind the killings. But to her total shock, she and Michael are drawn into a tragic story of an unthinkable betrayal committed over 60 years ago.