PARK CITY — The story is familiar to many and new to others but gutting to all.

Three men (boys at the time) were convicted and jailed for life for the murder of three eight-year-old boys. The case became known world-wide for its wrongful-imprisonment horror story elements. Fran Walsh and Peter Jackson joined the fight to have the trio released after years of prison time and along the way produced West of Memphis, directed by Amy Berg, with its world premiere Friday at the Sundance Film Festival.

TORn will share more about the evening and the film but for now, here is the trailer for this documentary produced by the director of “The Hobbit.”