Mrs Miller has lived a solitary but contented life since the death of her husband. By chance at the local cinema, Mrs Miller meets Miriam, a young girl with the same name who pretends to be with her to gain entry. After a series of disturbing events Miriam arrives late one night at Mrs Miller's apartment with a suitcase informing her she has come to live with her. Terrified, Mrs Miller rushes to her neighbors for help. They check her apartment but there is no sign of Miriam or her suitcase. Has Mrs Miller imagined it all? Who is Miriam, the child who threateningly demands 'Kiss me goodnight!'.