John Klein, a successful journalist, experiences a tragedy when his wife Mary dies after a car accident. Before her death, Mary had visions of a mysterious, moth-like creature. Two years later, John finds himself inexplicably drawn to the small town of Point Pleasant, West Virginia, hundreds of miles from where he intended to be. In Point Pleasant, he encounters locals who are also experiencing strange sightings and events involving a creature they call the "Mothman." As John delves deeper into these paranormal occurrences, he begins to unravel a terrifying pattern that suggests these premonitions are warnings of impending disasters.

He teams up with local police officer Connie Mills who is skeptical but sympathetic to John's plight. Their investigation reveals historical and current accounts of similar sightings, increasing John's obsession and fear. He receives cryptic messages and phone calls from an ominous source seemingly tied to the Mothman. With tension mounting and time running out, John grapples with the nature of these eerie phenomena and their potential connection to his own wife's death, racing against the clock to avert a looming catastrophe that could affect the entire town.