The Oscar-nominated final chapter in Joe Berlinger and Bruce Sinofsky’s documentary trilogy tracks the 18-year fight to prove the innocence of three West Memphis teenagers speciously convicted of three brutal murders. In 2011, the now-grown men were finally released from prison, and tonight’s film will be followed by a post-screening Q&A with West Memphis Three member Jason Baldwin. (SIFF Cinema at the Uptown, 511 Queen Anne Ave N, www.siff.net, 9:30 pm, $12)