‘If I Stay’: Chloë Grace Moretz Finds Love and Tragedy in First Trailer If you were asking yourself “When will Chloë Grace Moretz get her Young Adult adaptation?” your answer is here. The first trailer for the film based on the bestselling novel by Gayle Forman, ‘If I Stay’ (in theaters August 22nd) promises an emotional ride of youthful love, pain and second chances. “Mia Hall (Chloë Grace Moretz) thought the hardest decision she would ever face would be whether to pursue her musical dreams at Juilliard or follow a different path to be with the love of her life, Adam (Jamie Blackley). But what should have been a carefree family drive changes everything in an instant, and now her own life hangs in the balance. Caught between life and death for one revealing day, Mia has only one decision left, which will not only decide her future but her ultimate fate. “If I Stay” is based on the best-selling novel of the same name.”