In October 2021, anonymous user Carl92 uploaded 17 seconds of a mysterious lost song that sparked a global search to find it.

The catchy tune sounded so familiar to so many people. But for years nobody could find it.

Was it an unreleased demo from a major artist? An AI generated hoax? A track from a small band that never made it big?

Everyone Knows That: The Search for Ulterior Motives is a five-part miniseries about the history of the song, the tens of thousands of people who contributed to the search, and the song’s shocking discovery.