On paper, Silent Night opens on everything a Christmas postcard promises: an English country house, a tree weighted with lights, friends arriving with expensive wine and the best of intentions. The detail that complicates the picture — and it is not a small one — is that everyone present knows tonight is the last night. A toxic cloud is moving across the country. The government has distributed a pill that makes death painless. What remains is the party, and the question of whether anyone will make it through without saying the wrong thing.

Written and directed by Camille Griffin in her feature debut, the film premiered at the Toronto International Film Festival in September 2021 before its theatrical release that December. Griffin builds the entire premise on a single social question: what does a gathering do when the gathering has a fixed endpoint? Her answer is that it behaves exactly as it always has — the unsaid grievances, the children in conversations they should not be in, the host managing the temperature of both the plates and the room.

Keira Knightley and Matthew Goode play the hosts with the specific weariness of people who have been performing Christmas competence for too many years. Roman Griffin Davis carries the film’s structural weight: the child who refuses to accept the logic the adults have agreed on. He is the film’s spine, and the script is at its sharpest when it trusts him with the argument.

The ensemble around them — Annabelle Wallis, Lily-Rose Depp, Sope Dirisu, Kirby Howell-Baptiste, Lucy Punch, and Rufus Jones — fills the house with the pressure of people who have committed to behaving and may not all manage it. Griffin uses the group to trace class lines that the apocalypse does not erase but sharpens. The film is less interested in how the world ends than in who arrives at the ending with their composure intact.

The first half is more assured than the second. The setup is confident — the script lets social discomfort accumulate without over-explaining — but the back half pushes into territory the structure has some trouble carrying. The final act makes choices that are less ambiguous than what preceded them, and whether those choices feel necessary or abrupt depends on what each viewer brought to the table.

Silent Night does not resolve the gap between its dark-comedy surface and its dramatic weight, and it is possible this is precisely the point. What Camille Griffin stages is less a thesis on dread than a document of how a certain kind of person chooses to spend an impossible evening. The decorum holds longer than it should.