Twenty-three days ago, a mysterious advent calendar arrived on Officer Matthew Klein's doorstep — no sender, no return address, just a heavy wooden box with twenty-four numbered doors and a carved face with hollow eyes. Since then, every trinket inside has proven to be an omen of death, each prophecy fulfilled in violence and horror. The entity behind it is Zurvan, an ancient demon from Persian Mithraism — the same demon ten-year-old Matthew accidentally summoned through a spirit board on Christmas Eve, 1995, the night his house burned and his family died while he ran. Now Zurvan has returned to finish what he started, possessing Matthew's loved ones, murdering those around him, and enforcing one rule: open each door on schedule, or suffer consequences beyond imagination. Matthew tried to destroy the calendar. It came back. He refused to open a door. Snakes attacked his son. Now it's December 24th — the final door, the culmination of Zurvan's ancient mid-winter celebration — and Matthew is engulfed in flames, his home burning, his family scattered in the chaos. The countdown ends today.

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