Luna stands waist-deep in cold water in the well chamber, the grandmother's hand reaching through the mirror and gripping the locket she found in the garden. The ring from a memory burns in her palm as she realizes the grandmother's first child is not dead—she is trapped inside the mirrors, a prisoner of the bargain. Luna must choose between two reflections: one showing her sister's fate, the other revealing the grandmother's past. But when she touches the mirror, the water rises and the chamber tilts, flooding with memories that are not her own. She sees the grandmother as a young woman, desperate and pregnant, making a deal with something in the dark. The child born from that deal was not a child at all—it was a duplicate, a vessel for the grandmother's soul. And now Luna understands: the duplicate in the cellar is not her twin. It is the grandmother's first child, wearing her face. The episode ends with Luna submerged, the locket opening to reveal a strand of white hair, and a voice from the deep saying 'You were the second. She was the first.'