Watch Margot Robbie and Chris Pine in the tense first trailer for Z For Zachariah

The first trailer for post-apocalyptic thriller Z For Zachriah has been unveiled, scroll down and click to watch it. 

The movie is an adaptation of Robert C O'Brien's 1974 novel and stars Margot Robbie, Chris Pine and Chiwetel Ejiofor. 

Robbie plays 16-year old Ann Burden, the only survivor in a small US town after a nuclear war. After a year of surviving on her own, her solitude is interrupted by two new arrivals, first a complex and brooding scientists named Loomis (Ejiofor) and then the mysterious Caleb (played by Pine). 

The film premiered at the Sundance Film Festival earlier this year, it will be released into US cinemas on August 21st with a UK release date yet to be confirmed.