First it is worth noting that this is based on a novel written by a female, meaning it has appropriate sensitivity to the subject, a 40-something man and an 11-yr-old girl forming a love relationship. He is closer to a grandfatherly age, and in the book the age gap was even larger.
Ross Partridge is 40-something David Lamb with a few difficulties in his life. One day he is approached by this small for her age girl, Oona Laurence as Tommie, asking on behalf of her friends for a cigarette. Tommie is a good kid burdened with an uncaring mother and her mother's boyfriend.
She and David gradually form a bond, one which takes them on a road trip to the mountains of Wyoming. They share motel rooms, sometimes even the same bed, but all depicted in a non-sexual manner. She often acts and reacts like the little girl she is, he is always kind and gentle with her, and ultimately each of them come to profess love each other although we strongly suspect he is just being manipulative.
This theme has been explored before, twice by characters that Natalie Portman played, first in "Leon" and then in "Beautiful Girls." It is a theme that undoubtedly commonly exists in real life, especially where a young girl does not have a kind and loving father figure in her life.
Stories like this are easy to begin, but are harder to write in a satisfying ending. I wish I had access to the book, to compare it to how this one ended. It is open to lots of interpretation.
Very interesting movie, young Laurence is really great in the role. I watched it on Youtube free streaming movies.
Sept 2020 edit: I found the book and read it, most of the dialog is right from the book. While it ends about the same way the middle of the "trip" is a bit closer to "Lolita", although the author never gets specific some of the terms and imagery suggest that the relationship crossed over to a sexual one. Another difference, Lamb was in his 50s, making the age gap even larger.
