Share

One tap on "share" and there's no going back. Within hours, the montage had more views than the Grand Prix itself. The phone the tap came from was left behind in a café. Four people and a phone: one person per row, one per column. Whoever is left alone with it in the same room is the one you're looking for.

Suspects

• Amílcar, the café owner: He always has the TV on the news channel. That day he switched to Instagram.
• Bruna, the communications student: She's writing a thesis on viral videos. She used this one as an example and failed for lack of originality.
• Crispim, the crossword pensioner: He isn't on social media. He watched the video three times over Bruna's shoulder.
• Doralice, the waitress: She took coffees to three tables all watching the same video. By the third she was singing the anthem.