A Prayer Before Dawn is a 2017 British-French drama film directed by Jean-Stephane Sauvaire based on a true story of an English boxer incarcerated in one of Thailand's most notorious prisons where he quickly thrown into a terrifying world of drugs and gang violence, but when the prison authorities allow him to take part in the Muay Thai boxing tournaments, he realizes this might be his chance to get out. Billy embarks on a relentless, action-packed journey from one savage fight to the next, stopping at nothing to do whatever he must to preserve his life and regain his freedom.