In the video, the user clicked the top message. It was from an account with no profile picture, named simply User_00 . The message content was just a string of coordinates.

Leo watched his recorded self scroll down. Every single one of the 85 messages was from the same blank account. Each one sent a second apart. As the video played, Leo realized the coordinates in the messages were changing. They weren't random locations; they were moving.

He leaned closer to the screen. The last set of coordinates in the video—sent just before the recording ended—looked familiar. He typed them into a map search. The pin dropped directly onto his apartment building.