DEVIL'S KNOT transports the audience back to a tiny southern town gripped in fear over supposed satanic ritual murders and the trial and conviction of teenagers, Damien Echols, Jessie Misskelley Jr. and Jason Baldwin, also known as the West Memphis Three. Ron Lax (Colin Firth), a local private investigator, and Pam Hobbs (Reese Witherspoon), the mother of one of the victims, both come to suspect that all is not as it appears and while the police calls the crimes satanic, the truth may be far scarier.