Emmy and Screen Actors Guild Award-nominee Carrie Coon (“The White Lotus,” “The Gilded Age,” His Three Daughters and The Nest) and Emmy and Golden Globe®-nominee Lily James (upcoming Swiped and Cliffhanger, Pam and Tommy, Yesterday) have signed on to the cast of Harmonia, directed by Academy Award-winner Guy Nattiv. Coon and James join Bella Ramsey (“The Last of Us”) and Odessa Young in the cast, with the film being written by Nattiv and Noa Berman-Herzberg.

Set in the 1980s, the film is based on Nattiv’s grandmother’s experience with an insidious cult. Rita (Coon), unraveling from past wounds, meets a radiant young spiritual leader (James) after a chance encounter. Following her into the all-female commune known as Harmonia, Rita leaves her life and family behind until her daughters, Ella (Ramsey), and Jo (Young), embark on a dangerous journey to rescue their mother. Once immersed in the commune, they find themselves inexorably drawn into the leader’s labyrinth-like web of pseudo-spiritual and psychological manipulation.

Guy Nattiv said in a statement: “Harmonia is born from the true story of my grandmother—a woman whose quiet strength and unspoken pain left an indelible mark on our family. For years, her story lived in the shadows, and now, at last, I’m giving it voice. I couldn’t ask for more soulful collaborators than Carrie, Lily, Bella, and Odessa. Each of them brings a deep, intuitive grace to these layered characters, and their commitment to tell my story is tremendously moving.”

Julia Lebedev and Eddie Vaisman are producing for Sight Unseen, Jaime Ray Newman and Nattiv for New Native Pictures, and Oren Moverman as a standalone; Leonid Lebedev will serve as executive producer. Embankment Films represents international rights, and Bleecker has acquired the U.S. rights to Harmonia and plans a nationwide theatrical release in 2026.