I gotta defend this...
I'm seeing people on this message board saying they found the two storylines confusing and one doesn't have any relation with the other.
You shouldn't post such bold statements if you didn't watch the whole movie, guys!
Just over an hour into the film, the two lovers, Ben and Kate visit Ben's uncle, John on his farm. Danny is onto John for killing Dutch, who killed John's sister (Ben's mother) years before. This is where the two storylines connect.
Also: the writers tried something new and daring by having two polarizing genres with each of the narratives: one being romance, the other being thriller, combining them close to the end. There have been romantic thrillers, but they did something quite risky by keeping the genres seprate, essentially having two different films in one.
It's not perfect. It has its flaws. I thought some of the love storyline felt like filler and felt it wasn't as intriguing as the thriller.
But...
I think at the very least the filmmakers should be commended for taking this risk and be recognized for some quality direction and acting.