All it takes to change a life is a single moment. A random stabbing on a London bus leaves Eira stripped of a future that should have been hers and propels her into a life skewed out of all recognition. In Prague, the city where she and her husband got engaged, the city where now she flees to in her grief, 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 willing to take a minor risk. All she needs to do is pick something up, and drive back. Just once. Only ever once. Her mission takes her to a place where life is cheap and sordid deals are done. Risking her own life to save another, she must confront unspeakable evil and outrun those who would betray her.