Richard, a science-fiction writer, works from home. Gradually he becomes obsessed with his beautiful new neighbour, a woman called Angelica. Richard moves from normal desire to becoming psychologically unbalanced, when he begins to regulate his life to observe her. He starts to photograph her, soon he begins to follow her. Through deceit and lies, he manages to get close to her flat-mate and through her to Angelica herself. Richard is utterly ruthless in the pursuit of his obsession, eventually leading to triple murder. A twisted and incredible tale of suburban madness and infatuation with the girl next door.