El 21 de octubre de 1994, Heather Donahue, Joshua Leonard y Michael Williams entraron en un bosque de Maryland para rodar un documental sobre una leyenda local, "La bruja de Blair". No se volvió a saber de ellos. Un año después, fue encontrada la cámara con la que rodaron: mostraba los terroríficos hechos que dieron lugar a su desaparición.
Sinopsis en inglés:
In search of a local legend, three bold amateur documentarians--director, Heather; cameraman, Josh; sound recorder, Mike--hike into Burkittsville's gloomy Black Hills Forest to find a shadow: the fabled Blair Witch. Now, one long year later--after that fateful October of 1994--there's still no sign of the student filmmakers, apart from the raw footage they left behind. Who knows what truly happened during their creepy five-day journey into the mouth of madness? Was there, indeed, an intangible supernatural presence in the dark woods that led to the team's disappearance? Either way, the missing trio must have seen something. Could the nightmarish myth be real?