London is a ghost hunter’s dream, dotted with potentially haunted sites like mass graves of plague victims and the pub where Jack the Ripper’s final victim was last seen alive. But in the early 2000s, one of its most reliably spooky locations was the front room of a ground floor flat in north London. People reported feeling a supernatural presence, dizzying sensations, and even abject terror. The apartment wasn’t the site of anything grisly or nefarious that could explain these experiences, though: It was part of a scientific experiment on…
