What keeps the movie tantalizing is Chloa Sevigny's Lana, who might or might not know that Brandon is a girl but who's entranced by him anyway.
Lana is a tall and vivacious character. 
mnli hypothesis: Lana is a tall and vivacious character.  premise: What keeps the movie tantalizing is Chloa Sevigny's Lana, who might or might not know that Brandon is a girl but who's entranced by him anyway.