Siobhan Finneran delivers a convincing portrayal in this disturbing depiction of a tight-knit Jehovah’s Witness family as their mother, "Ivanna." She has two daughters who eagerly dedicate themselves to sharing their religious beliefs (often in Urdu) by going door-to-door within their neighborhood. It doesn't take long to realize that "Alex" (Molly Wright) is struggling and facing difficulties regarding a potentially life-saving blood transfusion that clashes with the family’s deeply held faith. Her sister, "Luisa" (Sacha Parkinson), further complicates matters when she reveals she’s pregnant by her boyfriend—who isn't part of their religious group and they are not married. The anticipated tragedy unfolds, severely challenging "Luisa’s" beliefs, leading to her isolation from the community to such a degree that even contact with her own mother is restricted. As this separation continues, both women must confront what matters most, and it’s at this point that the narrative becomes genuinely unsettling. While commenting on religious viewpoints isn't the purpose here, the story powerfully illustrates how unpleasant zealousness can be when rigid adherence leads to unhappiness for nearly everyone. The promises frequently made by religions—that positive experiences are blessings and negative ones are trials—are brought into sharp focus by director Daniel Kokotajlo, leaving a decidedly sour feeling. The two women at the heart of the story manage to create an atmosphere that really gets under your skin, and they’re supported, in a rather understated way, by the genuinely unpleasant portrayals of "Steven" (Robert Emms) and "Brian" (James Quinn), whose constant attempts to offer reassurance—"we understand, but..."—while facing grief and despair make you want to react strongly. As a drama, the production is straightforward, allowing the religious themes to take precedence; although it’s not an easy viewing experience, it does prompt considerable reflection on the ideas of unquestioning belief.

Source on TMDB