A small group drives into what turns out to be a monster domain and a voice orders them not to move. A Special Abilities Investigation Bureau agent calls it a Level-C domain and explains the Red Light, Green Light rule: those who step are petrified and those who stay frozen are safe. Escape requires grabbing a ruby from a Gargoyle's head within ten minutes. Level-C normally needs five Level-D mutants, but this group is underpowered. A frightened child pleads to a parent, and despite the risk they accept the task. Their escape now depends on beating the dangerous game.