After reading about their story, I'm confused about the inspirational tone in the second half of this trailer - the tagline and words like 'astounding' and 'joyous'. Even in some of the writeups about the film, it makes it sound as though their bond was a good thing, but the truth is dark and tragic. One of the sisters had to meet a sad fate in order for the other to feel that she was finally free of her and able to live a better life. This trailer seems to romanticize a very unsettling story.