The extraordinary true story of Gertrude (Trudy) Ederle, who in 1926 became the first woman to successfully swim the English Channel. Daisy Ridley stars as the accomplished swimmer who was born to immigrant parents in New York City in 1905. Through the support of her older sister and trainers, she overcame adversity and the animosity of a patriarchal society to rise through the ranks of the Olympic swimming team and complete the staggering achievement – a 21-mile swim from France to England.