In the winter of 2019, Luna visits a small church in Millbrook, Illinois, where a single stained-glass window departs from its biblical scene to show something else entirely — a figure standing at a door that does not exist in the church's architecture. The parish priest, Father Callahan, tells her the window was installed in 1923, but no record of its design exists. As Luna kneels in the pew, she notices the figure's hand is raised, not in blessing, but in a gesture that looks like knocking. And the door — it is slightly ajar, leading to darkness. Each time she looks away and back, the gap widens. By midnight, she is alone in the chapel, and the window has begun to cast a shadow that does not align with the candlelight. A quiet, lingering story about what waits on the other side of a door no one meant to open.