Unknown Caller (2014)

In a chilling game of cat and mouse, a calculating psychopath exploits a family's impenetrable smart home. He turns their sanctuary into a pressure cooker, armed with a ticking time bomb and a single, haunting question: "Who am I?" For ninety relentless minutes, they are subjected to psychological torment, forced to confront a past they desperately try to bury. As the clock winds down, they must unravel the mystery of their tormentor’s identity to survive, or become victims of his twisted game. The family teeters on the brink of oblivion, desperately seeking an answer before time runs out.