Inspired by the Northern Bank robbery that took place in Belfast in 2004, Ourselves Alone is set in the house of a bank manager and his wife, who are taken hostage by brother-and-sister IRA members - Aoife and Sean. They plan to force the bank manager to help them carry out the robbery. But when a psychopathic third IRA member - Liam - arrives at the house unexpectedly, things start to go wrong.