From Deadline | Hollywood:

American Horror Story regular Dylan McDermott has joined the cast of Mercy, a fantasy horror project based on a Stephen King story from the author’s Skeleton Crew collection. Peter Cornwell is set to direct from a script by Matt Greenberg. Project is from Universal Pictures and Blumhouse Productions which has a first-look deal with the studio. Frances O’Connor (The Hunter), Chandler Riggs (The Walking Dead) and Joel Courtney (Super 8) will also star. Paranormal Activity creator Jason Blum will produce with McG and Mary Viola from Wonderland Sound and Vision. McDermott, who also appeared in The Perks Of Being A Wallflower and The Campaign, is represented by CAA and managed by The Schiff Company.