Open Grave is a 2013 American post-apocalyptic horror film directed by Gonzalo López-Gallego, starring Sharlto Copley and Thomas Kretschmann, Joseph Morgan, Erin Richards, Josie Ho, and Max Wrottesley in supporting roles. Josie Ho plays the character of a mute. All the characters, excluding the mute, suffer from amnesia and cannot remember anything from their lives. The story follows them trying to figure out their identities and their past while evading zombie-like humans affected by rage virus and also their struggle to escape the forest they are stuck in. The film received generally negative reviews from critics.
(Summary from Wikipedia)