Mute Witness

Billy (Marina Zudina), an Special effect make up artist who does not have the physical ability to speak, is in Moscow working on a low budget slasher film directed by her sister's boyfriend Andy (Evan Richards). On one particular night Billy returns to the set to fetch a piece of equipment for the next day's shoot when she is accidentally locked in the studio. Being unable to speak but having the ability to communicate with her sister Karen (Fay Ripley), Billy makes several telephone calls but is interrupted when she discovers a small film crew working after hours to shoot a cheap porno film. Watching unseen, Billy is amused until the performed sex becomes sadistic. When a masked actor pulls out a knife and stabs the actress (Olga Tolstetskaya), Billy reacts and is discovered. She flees pursued by the homicidal film crew.