Villa Diodati, 1816. Mary Shelley, Lord Byron, Percy Shelley, John Polidori, and Claire Clairmont spend a strange summer at the lakeside house in Geneva. The outside world darkens under a sunless sky, while closed doors reveal shadows that shouldn’t exist. The creatures they have imagined in their stories are beginning to come to life in impossible ways.

And then Julian arrives.

Julian is a young 20th-century pilot, scarred by war and by an impossible experiment: to change a past event to see if the future can be rewritten. But the longer he stays at the mansion, the more evident it becomes that his mere presence is breaking something fundamental.

Elisabeth, a young maid at the mansion, seems to be the only one realizing what is happening. Increasingly aware that she is at the heart of something that could alter not only the course of history, but also her own life, she will try, alongside Julian, to understand the limits of time and the strange logic that governs Villa Diodati: a house that observes, that reacts, and that perhaps is alive.