"They're calling it the worst pile-up in London history. Driving home, Margaret Holloway has her mind elsewhere-on a troubled student, her daughter's acting class, the next day's meeting-when she's rear-ended and trapped in the wreckage. Just as she begins to panic, a disfigured stranger pulls her from the car just seconds before it's engulfed in flames. Then he simply disappears. Though she escapes with minor injuries, Margaret feels that something's...