John Coniston is the manager of a cash counting house who leads a normal life - he's married and scraping by in order to pay his mortgage. The books at the counting house are always balanced, with not even a fiver going missing without him knowing about it. But that all changes one day when, while checking the accounts, he notices that £50,000 is missing. When he suspects two men - security guard Chris and forklift driver Marcus - of being responsible for the missing money, he calls them into his office to confront them. But instead of turning them in to the authorities, he offers them a way out that will change their lives forever: they plan and execute a multimillion-pound cash heist.