When architectural draftswoman Hannah Reed moves into Unit 4B of the old St. Jude Mansions with her partner, Adrian Lockwood, she expects the usual inconveniences of an aging Edwardian building. Instead, she discovers a strange and unsettling feature in the master bathroom: a massive antique mirror embedded directly into the chimney breast, its dark walnut frame seemingly inseparable from the surrounding masonry.At first, Hannah approaches the mirror as she approaches every problem-with measurements, observation, and rational explanations. But its surface behaves in ways that defy ordinary physics. Her reflection hesitates when she blinks. The glass radiates a freezing cold that seems to drain warmth from her body. And at exactly 3:17 in the morning, three deliberate knocks sound from somewhere beyond the silvered surface.Adrian tries to reassure her, attributing the strange experiences to exhaustion and the stress of their move. Yet Hannah's fear grows as the mirror's influence spreads through the apartment. The building's history, its hidden spaces, and the warnings of people connected to St. Jude Mansions suggest that the mirror is not an ordinary antique. Something exists on the other side, and it appears to know Hannah.Determined to understand what she is facing, Hannah investigates the building and its past. Her search leads her toward forgotten records, disturbing photographs, and the history of Clara Whitfield-a woman whose connection to the mirror may explain the strange presence watching from within it. But the deeper Hannah goes, the more difficult it becomes to distinguish between the physical world and the impossible space behind the glass.As sleep deprivation, fear, and supernatural interference begin to consume her, Hannah must confront the true purpose of the mirror. It is more than a doorway or a reflection. It is a predatory boundary with its own rules, and crossing it may demand a price far greater than she can imagine.In a story where every reflection may conceal another presence, the most terrifying sound is not a scream from the darkness, but three quiet knocks from the other side of the glass.