Mona (Natalie Press), a West Yorkshire lass, is down on her luck. She never knew her father, her mother has died of cancer, and her brother (Paddy Considine) -- once the violent owner of the pub they live above -- has turned to Christianity. Into Mona's life trots Tamsin (Emily Blunt), a rebellious girl home from boarding school, who shows Mona something she's never seen -- a sophisticated, self-dramatizing form of adolescent ennui and self-obsession. They fall in love. Directed and co-written by Pawel Pawlikowski (a Pole working in English), the film rises above its particulars. Its immediate subject is a few months of heated passion between two girls, but it's really about the psychology of need, and of want, and of abandonment -- especially for adolescents whose parents aren't around. Pawlikowski shows a fantastic level of commitment -- in the script, the photography, and the acting -- and the result is a mood movie that sweeps you into its infatuation and holds you there.