One night, as autumn thinned to a brittle December, Mira opened a file labeled only "untitled_last." The photograph was a mirror image—her studio, empty, lights off. In its center a sliver of paper lay on the table. She recognized her own handwriting on the top line: Find the pieces that still make pictures. Below it, in Jonah’s spidery hand, were three new words she’d never seen: Pass. Key. Forward.