A producer at the Belfast bureau of the BBC, Tessa is at work one day when the news of another IRA raid comes on the air: as the anchor requests the public's help in locating those responsible for this latest attack - a robbery at a gas station - Tessa's sister Marian appears on the screen, pulling a black mask over her face.

The police believe Marian has joined the IRA, but Tessa knows this is impossible. But when the truth of what has happened to her sister reveals itself, Tessa will be forced to choose: between her ideals and her family.