This might be tough movie to watch. Reese Witherspoon and Colin Firth star in the "Devil's Knot" based off of Mara Leveritt's book, by the same title, which follows the true story of the infamous West Memphis Three. In 1993, Damien Echols, Jason Baldwin and Jessie Misskelley Jr. were convicted of killing three young boys in Arkansas as part of a satanic ritual.  The teens later became known as the West Memphis Three ... but were eventually released after being wrongly charged in 2011. In the flick, Reese stars as the grieving mother, Pam Hobbs, who's 8-year-old son was one of the mysteriously murdered boys. Firth plays the private investigator, Ron Lax, who's not convinced that teenagers were responsible for the brutal crimes. There's been a ton of controversy around the trial, and stars like Peter Jackson, Natalie Maines and Johnny Depp are just a few of the celebs who've involved themselves in the case,...