When troubled divorcee, Mary Kee, sets up home in her new apartment, she stumbles across an old telephone which she quickly falls in love with. Struck by it's antique charm, she gives it pride of place in her home. Before long, Mary begins to receive strange phone calls from a mysterious, unknown caller. Over time, she discovers that the caller is a woman called Rose and the two strike up an unlikely friendship. However, when Rose claims to be calling from the past, Mary begins to question her new friend's motives.
As Rose's phone calls become ever more disturbing, Mary's sense of terror escalates. Feeling haunted in her own home, she cuts all contact with Rose. Enraged by Mary's betrayal, Rose threatens to exact her terrible revenge. Not on Mary in the present but on Mary as a child in the past. Mary finally realizes that she will have to kill Rose in order to save herself. But how can she kill someone living in the past and what will happen if she fails?