Chloe Grace Mortez stars in the trailer for the thrilling drama If I Stay. The film tells the story of a young woman called Mia Hill who is involved in a car accident that puts her in a coma. During this time while out of her body, she has to decide whether to move on or wake up. Before the coma, the 17-year old aspired to be a musician and attend Julliard but had also fallen in love with musician Adam played by Jamie Blackley. If I Stay is based upon the book written by Gayle Forman, with Shauna Cross writing the script for the film. It will be released in UK cinemas on August 29, 2014.