In the Australian film "Son of a Gun," teenager JR is sent to a prison in that nation for a minor offense. His sentence is 6 months. They tell him in intake that if he keeps his nose clean that could be reduced to 3 months.
Naive, he immediately puts himself at risk by trying to protect an emotionally retarded young inmate. The latter is being bullied by gang members.
Public enemy #1 Brendan Lynch clues JR in: Mind your own business. In exchange for Lynch's wisdom, which boils down to protection, JR will have to help the notorious criminal break out of prison.
What's clear is that this is a deal JR can't refuse. This prison in Australia is filled with violence, as entrenched and brutal as what we hear about in America's lock-ups. No, at least from what's depicted in this film, the Australian approach to incarceration isn't any more progressive than the American one.
Brendan saves JR from a gang rape and more. We witness a man being tossed over the railing and killed. The blood streams from his head. The emotionally stunted man-child attempts suicide.
JR is successful in orchestrating the break-out from a helicopter. He ends up rich and gets the girl. But in between intake at prison and that happy ending he hardens into a criminal strategist and sees way too much. In fact, what happened in prison was sort of the Happy Valley compared to what he has to learn to survive after helping Brendan.