Based on the Russian sci-fi novel &NFi;Roadside Picnic&NFi_;, this science fiction milestone from director Andrei Tarkovsky takes you into the Zone, a mysterious, guarded realm containing a mystical room in which occupants' secret dreams come true. Stalker, a man able to lead others to this holy grail, escorts a writer and a scientist through this foreboding territory and confronts several unexpected challenges along the way.