Desperate to put the horrific events of her past behind her, Katherine (Jewel Staite) relocates to Washington, DC, after high school to become a journalist. Ten years later, she is summoned back to her hometown to cover the annual Mothman Festival. There she must face her estranged friends, and the life-altering drowning they covered up as high school seniors. The group begins to experience terrifying visions, and soon figure out that the Mothman isn’t a mere fairy tale… and it wants its revenge for their crime.