"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 Weekly

Five days ago, a homeless man on a subway... (read more)