In Klong Prem there are ten rules. If you break them you will almost certainly die. If you don’t break them you will definitely die. This is the true story of Billy Moore – jailed in one of the world’s toughest prisons, Klong Prem, the notorious “Bangkok Hilton.” Refusing to die there, Billy becomes a student of the lethal art of Muay Thai Boxing, and in the process finds a brotherhood that will help guide him on an incredible journey to redemption.Filmed in a real Thai prison, A Prayer Before Dawn takes its cues from author Billy Moore's own 2014 book as adapted by Nick Saltrese and later by Jonathan Hirschbein. Peaky Blinders actor Joe Cole leads the film as Moore as of late 2015, replacing actor Charlie Hunnam who was cast a year earlier.