Leo found the file on an old, silver thumb drive tucked into the pocket of a thrifted denim jacket. It wasn't encrypted, just sitting there amongst school essays and corrupted MP3s: TeenPhotoClub_-_Isadora.zip .

The final folder was titled Self-Portraits . As Leo scrolled, the photos of Isadora became increasingly overexposed. In the first few, she was a sharp-featured girl with a vintage Leica camera. By the middle, she was a blur of movement. In the last photo, the frame was just a blinding, pure white rectangle.

Leo looked up from his laptop. He realized the thrift store where he bought the jacket was only three blocks from the streetlamp in the photos. He walked there that night, arriving just as his phone clock flipped to 3:00 a.m.

Isadora had a ritual. Every night at exactly 3:00 a.m., she took a photo of the streetlamp outside her window. The first hundred photos were identical. But in the 101st photo, a silhouette appeared in the light.