Undertone

Evangeline "Evy" Babic is a young woman with a Catholic upbringing, living alone with her comatose mother whom she cares for. She and her friend Justin run The Undertone, a horror podcast where they report on supernatural occurrences, which Evy dismisses as hoaxes while Justin fully believes they are real. One day, Justin is sent an anonymous email containing a seemingly random string of letters and ten audio files, which they play on the podcast.