A single mom and her two boys help take care of their grandmother with mystical powers.
Mercy is a 2014 American supernatural horror film written by Matt Greenberg and directed by Peter Cornwell and is loosely based on the short story "Gramma" by Stephen King. It stars Chandler Riggs, Joel Courtney, Shirley Knight, Mark Duplass, Dylan McDermott and Frances O'Connor. It was produced by Jason Blum for his Blumhouse Productions banner and McG. The film was released straight to video by Universal Pictures Home Entertainment on October 7, 2014.