"She's impure!"
Selah is a young girl born into an alternative religion, the members of which – all women and female children – live in a rural compound, and are led by one man, known only as the Shepherd. Teenage Selah, is given the great honor of participating in the sacred ritual of the birthing of the lambs, where she has a shocking and transformative experience. She begins to have strange visions that make her question her own reality, and everything the Shepherd has taught her and her sisters.