Who Do 你 Think Is Red Coat? In the movie

Red 涂层, 外套 may be Ally`s twin sister. When the 火, 消防 was started Mona and Hannah both 说 they saw Ally. So Red 涂层, 外套 must either be Ally 或者 her twin sister. Ally might not even be dead. She is always around. She could be A.