When you hear a film is going to be about a teenage girl having an affair with her mother's boyfriend, 'Fish Tank' immediately springs to mind. While in 'Fish Tank' it was an occurrence that brought the film's drama to a head, it wasn't the main premise of the film. Here it is, and it's a dangerous premise - it could easily go so very wrong, but I enjoyed this film incredible amounts.
Bel Powley is absolutely captivating as 15-year-old Minnie, who lives in 1970s San Francisco and dreams of being a cartoonist. The film opens with her saying something like, "I had sex for the first time last night." The little smile that plays on Minnie's face lets you…