1995, the Swiss Alps. Patricia Highsmith, the queen of the thriller, now ageing and ailing, hides away in her study, surrounded by her collection of books and antique weaponry, finding solace in her seclusion, her cats and cigarettes. Vitriolic, bigoted and alcoholic, her eccentricities are the stuff of legend. A polished young man turns up, sent by her New York publisher to persuade the great writer to pen one final instalment of her best-selling series featuring the master manipulator, Tom Ripley. But as day breaks over the mountains, it becomes clear that the charming stranger is set on a far more sinister mission.