When a hospital is inundated with patients that have fallen into coma-like trances, Torchwood move in to investigate. They find that the trances were triggered by phone calls, all of which were made from a number that hadn't been active for over 30 years. Determined to find out who's been calling the unfortunate victims, Jack rings the mysterious number — two, zero, five, nine — nothing. It's a dead line. Until it calls Jack back, he answers — and falls into a deep trance. The team race against time to find the source of the "infection" and save the patients.