Villa Diodati, 1816. In a villa on the shore of Lake Geneva, Lord Byron, Percy Shelley, and his young wife Mary, gathered for the summer. For three glittering months, this party of young bohemians would share their lives, charged with sexual and artistic tensions. It was a period of extraordinary creativity from which would emerge some of the masterworks of the Romantic period, including ‘Frankenstein’. But there were two other guests at the villa that summer, for whom the season would not be so rosy. With Byron came his young physician, John Polidori, a man with literary aspirations of his own. And joining Mary was her step-sister, the beautiful Claire Clairmont. For Byron and the Shelleys, their stay by the lake would serve to immortalise them in the annals of literary history. But for Claire and Polidori, the Swiss sojourn would scar them forever.