This is the extraordinary true story of Trudy Ederle, the first woman to successfully swim the English Channel. Through the steadfast support of her older sister and supportive trainers, she overcame adversity and the animosity of a patriarchal society to rise through the ranks of the Olympic swimming team and complete the 21-mile trek from France to England.

Ana is transported to a dreamlike and dangerous land where she joins an army of girls engaged in a never-ending war. Even though she finds strength in this exhilarating world, she realizes that she's not the killer they want her to be, and time is running out for her to get home.