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Passed over at work and living in monastic luxury in her wipe-clean London apartment, brittle businesswoman Charlotte (Maxine Peake) comes home to find her Polish cleaner smoking , firing her on the spot. An argument ensues, and she soon finds herself caught in an escalating catastrophe that unfolds tensely, seemingly in real time.

The third-act intrusion by Blake Harrison's (Neil from The Inbetweeners ) manic security guard opens the film up too far. But Peake is typically excellent throughout, helping Steve Reeves' debut (from a smart script co-authored with Mike Oughton) to emerge as an old-fashioned, quietly coiled thriller of things that could happen.