Warner Bros has unveiled a new trailer for If I Stay, Digital Spy reported.

The film - based on the novel by Gayle Forman - stars Chloe Moretz as talented 17-year-old cellist Mia Hall, who is involved in a devastating car accident.

Titled "Prologue", the clip shows a spectral Mia struggling with the decision of whether to fight back and awake from a coma or to let go of life and leave her family and boyfriend behind.

If I Stay also stars Mireille Enos, Joshua Leonard, Liana Liberato, Aisha Hinds and Stacy Keach.

According to the LA Times, Cutler previously said of the film: "This is unlike anything I think you've ever seen [Moretz] do.

"She will capture your heart and break it in the same moment."

If I Stay hits US screens on August 22. A UK release date is yet to be announced.