Behind the walls of a young offender institution, Troy is thrust into a brutal world of gangs, loyalty and violence from the moment he arrives. When an unspoken bond develops with a fellow inmate, it becomes a dangerous vulnerability for them.

'H3' is a universal story of endurance and courage set inside Europe's most secure prison, the Maze prison in Northern Ireland. Here, in H3 - the bleakest of all the H-blocks - a group of young republican prisoners hold out for what they believe in, refusing to be labeled as criminals or co-operate with prison authorities. However, British Prime Minister Margaret Thatcher is determined that these Republican prisoners will be treated like all the other common criminals in British jails, ending a special regime which allowed the inmates political status to organise life inside the jail along POW lines. The republican prisoners immediately start a 'no-wash' protest, refusing to wear prison-issue clothes or perform work duties, a protest which results in their being locked in their cells for hours on end without exercise, recreation, reading materials and with only blankets to wear for heat...