Hannah is a young woman who lives on her own. She starts to get this feeling that she is being watched. The phone starts ringing at night and when she answers, no one is there. Is she imagining everything or is it for real?

Hannah is a young woman who lives on her own. She starts to get this feeling that she is being watched. The phone starts ringing at night and when she answers, no one is there. Is she imagining everything or is it for real?