All it takes to change a life is a single moment: a random stabbing on a London bus leaves a young woman stripped of her future and propelled into a life skewed out of all recognition. Bethan is anti-heroine we root for - flawed, vulnerable, and uncomfortably familiar. In Prague, the city where she and her husband got engaged, a chance meeting leads to an intriguing proposition. There's a small job for someone like her: someone without a criminal record or personal connections; someone willling to take a minor risk. All she needs to do is pick something up, and drive back. Just once. Only ever once.