It was only a nightmare...right? When teenager Cassie Wilson volunteers for a study in psychic phenomena at the university, she figures it will be a lot of fun. But the experiment goes terribly wrong and Cassie ends up in the hospital. She's fine, except for the terrible nightmares—and each one is worse than the last. Cassie makes a startling what she sees in her nightmares comes true. But when she tries to warn people of the danger, no one believes her! Instead, her friends turn on her. Then her neighbors. Fear turns to anger. Mobs hunt Cassie down like an animal. But the nightmares grow stronger....