Intense and troubled Lydia (Maisie Williams - 'Game of Thrones') and charismatic Abbie (Florence Pugh - 'Midsommar') are best friends experiencing a sexual awakening at their strict English girls' school. Following a tragedy, a mysterious fainting epidemic breaks out. As Lydia's symptoms worsen, she rallies against the school's authorities to uncover the underlying cause of the outbreak. Eventually her actions force old secrets to rise to the surface and she finds herself faced with a truth that she never expected.