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"A PAGE-TURNER . . . THOROUGHLY FRIGHTENING."--Newsweek"ENORMOUSLY ENTERTAINING."--The New York Times Book Review"THIS BOOK SCARED THE LIVING DAYLIGHTS OUT OF ME. . . . Manages to grab you with the authenticity of its scientific detective work and haunt you with its sheer plausibility."--Entertainment WeeklyFive days ago, a homeless man on a subway platform died in agony as startled commuters looked on. Yesterday, a teenager started having violent, uncontrollable spasms in art class. Within minutes, she too was dead.Dr. Alice Austen is a medical pathologist at the Centers for Disease Control in Atlanta. What she knows is that the two deaths are connected. What she fears is that they are only the beginning. . . .