In 2004 armed men coerced two bank employees into stealing £26.5 million from the Northern Bank in Belfast. Now, almost two decades later, two journalists revisit the unsolved case and look at the police investigation, legal prosecution, and how suspected ties to the IRA influenced the Northern Ireland peace process.

Slim Williams, a small-time dealer, is poised to make his big score with his partner Paulie. But the easy deal becomes a nightmare when Slim is caught in deadly police sting and ends up in a maximum-security penitentiary. Sold out by his partner, Slim is forced to learn the rules of survival behind bars - forget what you know. Inside these walls, there are no laws.