Z for Zachariah is a 2015 Icelandic science fiction drama film, based on the book of the same name by Robert C. O'Brien, directed by Craig Zobel and written by Nissar Modi. The film stars Margot Robbie, Chiwetel Ejiofor, and Chris Pine. The film was released on August 28, 2015, in the United States by Roadside Attractions.
Nuclear apocalyptic survivor Ann Burden ekes out an agrarian life on her family's valley farmstead, sheltered from radioactive contaminants by rocky hillsides, favorable weather patterns, and an abundant ground-fed water supply. One day Ann encounters fellow survivor John Loomis, a highly-skilled engineer, who, aided by medicines and a radiation suit, has traveled from a distant military bunker to the safe confines of Burden's valley. Loomis bathes in contaminated water, and immediately sickens, but is nursed back to health by Ann, who welcomes him into her farmhouse.