Now available on Blu-ray is Mercy, Peter Cornwell's feature length adaptation of Stephen King's short story Gramma, which follows a single mother (Frances O'Connor) and her two young sons as they move into a remote country estate to care for her ailing mother, Mercy (Shirley Knight). Unlike most grandmothers, Mercy isn't all candies and kisses on the cheek, and as her prognosis gradually worsens the family learns shocking truths about the source of Mercy's darkness. Mercy also stars Chandler Riggs, Mark Duplass, Dylan McDermott, and Joel Courtney. Early last year I joined a handful of journalists on set while they were filming in Simi Valley. While there we had an opportunity to interview McDermott, who plays family friend Jim Swann in the film. He talked about how different Mercy is to American Horror Story, why he likes working in horror, why he thinks the genre resonates with today's audience,...