The Long Walk is one of Stephen King‘s most harrowing books, and the upcoming film adaptation doesn’t seem to be shying away from the intensity with its “R” rating from the MPA.

The Long Walk is rated “R” for “strong bloody violence, grisly images, suicide, pervasive language, and sexual references.”

Based on King’s 1979 dystopian novel of the same name, the film arrives in theaters on September 12 from Lionsgate.

The story follows Raymond Garraty, a 16-year old who takes part in an annual contest in which 100 teens must journey, nonstop and under strict rules, until only one is left alive.

Francis Lawrence (I Am Legend, Constantine) directs from a script by JT Mollner (Strange Darling).

Cooper Hoffman (Licorice Pizza), David Jonsson (Alien: Romulus), Garrett Wareing (Manifest), Tut Nyout (The Witcher: Blood Origin), Charlie Plummer (The Clovehitch Killer), Ben Wang (Karate Kid: Legends), Roman Griffin Davis (Jojo Rabbit), Jordan Gonzalez (Pretty Little Liars: Origin Sin), Joshua Odjick (Welcome to Derry), Josh Hamilton (The Walking Dead), Judy Greer (Halloween), and Mark Hamill (The Life of Chuck) star.

Francis Lawrence produces with Roy Lee (IT, Doctor Sleep), Steven Schneider (Insidious, Paranormal Activity), and Cameron MacConomy (The Hunger Games: The Ballad of Songbirds & Snakes).