The Third Planet.

Drawing heavily from Arkady and Boris Strugatsky's 1971 novella 'Piknik na obochine' ('Roadside Picnic') as well as Andrei Tarkovsky's 1979 film adaptation ('Stalker'), 'Tretya planeta' tells the story of a father seeking a cure for his ill daughter by venturing into an area known only as "The Zone" to request help from the mysterious healers that dwell within its forbidden borders.