When school is canceled because of snow that evolves into freezing rain, Alice and Henry Burton find themselves hopelessly bored at their grandparents old house in downtown Charleston, South Carolina. Things begin to turn around for the siblings when an old deck of playing cards reveals a mysterious and strange riddle. Compelled by curiosity, Alice and Henry venture into the deserted streets on a quest to solve that riddle. What starts as a simple game soon thrusts the children into a perilous world where nothing is as it seems and their success or failure may mean the difference between life and death.