Amazing Grace works best as an argument for Hannah Walters, who has been quietly excellent in supporting roles for years and here finally gets a lead that asks everything of her. As Grace, the overnight helpline counsellor fielding calls from Walter — a suicidal, isolated working-class man played by Daniel P Lewis, who also wrote the screenplay — Walters has to hold the film entirely through voice, posture, and the micro-expressions of someone trained to listen rather than react. She does it. The film around her does it less consistently. The structural problem is baked in from the premise: Walter hangs up and calls back, hangs up and calls back, each cycle of confession and reaction reset by his refusal to stay on the line. This is psychologically honest — people in crisis don't proceed in straight lines — but it means the drama keeps recycling itself. Lewis's performance is pitched at maximum intensity from scene one, which is a coherent choice for a man on the edge, but it leaves the film nowhere to escalate. You feel the ceiling early. Director Ruth Carney's most genuinely impressive decision is the production design. Walter's house is a document — every unopened envelope, every unwashed dish, every dusty trinket is doing characterisation work that the dialogue reaches for and sometimes misses. The inarticulate man made legible through his accumulated objects: that's the film's smartest move, and Carney and her design team execute it with forensic care. The flashbacks are the persistent miscalculation. Carney cuts to them repeatedly to explain what drove Walter to this edge — the violence, the losses, the specific shape of his loneliness. The instinct is understandable: show don't tell, make it visual. But the effect is the opposite of what's intended. The revelations that should be landing like confessions, arriving haltingly through a phone call, instead arrive pre-digested. The audience gets the answer before the scene asks the question. It's hard to be harsh about a film whose sincerity is this transparent and whose purpose is this clearly humane. Lewis wrote this to show people in pain that the phone can be answered, that someone can listen, that the other end of the line is real. That intent radiates off the screen and softens the critical response in ways that aren't entirely fair to either the film or the audience. A formally tighter version of this story — one that trusted its performances and its production design and cut the explanatory flashbacks entirely — would be a significantly better film. What exists is a good-faith effort with one exceptional performance at its centre.