"One night in Tokyo, four healthy teenagers die one after another of heart failure. A journalist, the uncle of one of the victims and intrigued by the coincidence, investigates and learns of a videotape that the four watched together a week before dying. Amid a series of bizarre and frightening images is a warning that the viewer will die in exactly one week unless a certain act is performed. The description of the act, of course, has been erased from the videotape, and the journalist's work to solve the mystery assumes a deadly urgency. "--Publisher's description.