What they needed was an expert to go back to the Empty World and find the lost grown-ups. What they had was Christy. With the ever-faithful Trevor in tow, Christy defies her mother's wishes and ventures back to the Empty World. Her father and Detective Lockhart have been missing for months, and she's determined to bring them home safely. But trouble-maker Cory has his own reasons for wanting to go back, and he bullies Christy and Trevor into...