In seventh grade (over twelve years ago), I read a novel that I remember something about but not enough to find out what it is without hearing from somebody who read it. The antagonist is a girl or woman who calls the protagonist's house all night because she's angry. She switches from calling the protagonist's father to the protagonist. The protagonist's father (possibly the protagonist but I think the father) accidentally caused a fire at a theater that hurt the antagonist (that's why she's angry), and in the novel the reader reads about the fire twice, once from the point of view of the person who caused the fire and once from the victim. At the end, the antagonist and her brother try to murder the protagonist, who I think was a teenager, by injecting him with something while they're sitting in a car but the protagonist escapes.