According to an update from Deadline.com, Mark Duplass (Zero Dark Thirty) has joined the cast of Mercy, the film adaptation of Stephen King's skin-crawling Skeleton Crew short story "Gramma," about two boys and their creepy bed-ridden grandmother, who turns out to have occult powers. The story, which is loosely tied to H.P. Lovecraft's Cthulhu Mythos, was previously adapted by accclaimed author Harlan Ellison for the '80s Twilight Zone series, but this will be the first feature-length version.
"Gramma" was adapted for the screen by writer Matt Greenberg (who previously adapted King's 1408) and directed by Peter Cornwell (A Haunting In Connecticut). Duplass will co-star with Dylan McDermott (American Horror Story), Frances O’Connor, Chandler Riggs, Joel Courtney, Shirley Knight and Chris Browning. The film is tentatively slated for a 2014 release.