A Prayer Before Dawn is a 2017 biographical prison drama film directed by Jean-Stéphane Sauvaire and written by Jonathan Hirschbein and Nick Saltrese.

The film stars Joe Cole and is based on the book A Prayer Before Dawn: My Nightmare in Thailand's Prisons by Billy Moore.

Billy Moore, a young British boxer and troubled heroin addict, is arrested in Thailand after being charged with possession of stolen goods and a firearm.

Billy's experiences with the other prisoners and personnel are tense, at one point going into a violent frenzy and biting into the neck of a corrections officer after being refused painkillers.

Life in prison worsens for Billy, and he retreats into heavy drug abuse; he subsequently beats two Muslim chefs half to death after being bribed ya ba by a corrupt corrections officer.

Even worse, it is established that Billy is suffering from a hernia due to his drug abuse, and any subsequent damage could result in severe internal bleeding.

Closing titles reveal that after serving three years, Billy Moore was transferred to a UK prison and released on an amnesty by the King of Thailand in October 2010.

The website's critical consensus reads, "A Prayer Before Dawn is far from an easy watch, but this harrowing prison odyssey delivers rich rewards — led by an outstanding central performance from Joe Cole.