A Prayer Before Dawn (2017)

Directed by Jean-Stéphane Sauvaire, A Prayer Before Dawn (2017) stars Joe Cole and Vithaya Pansringarm. Based on the memoir by Billy Moore, the film tells the true story of a British boxer imprisoned in Thailand who turns to Muay Thai training in an attempt to survive the brutal prison system. The film combines prison drama, crime and combat sports in a story based on real events.

Från IMDB:
The true story of an English boxer incarcerated in one of Thailand's most notorious prisons as he fights in Muay Thai tournaments to earn his freedom.