A screenwriter sits in a lovely rented house somewhere up an Alp in early December. The air is clear, the views stunning, the isolation splendid. He rented the home through Airbnb — surprisingly cheaply, as it happens. He has come to this place for a family holiday with his wife Susanna and their four-year-old, Esther, but also to get some peace and quiet in which to concentrate on his current job.