It felt like I lost interest pretty early on because the characters consistently make such nonsensical decisions. The story begins in the nineteen seventies as "Marina" (played initially by Anna Poppelwell and later by Friel) and her friend "Holly" (Ella Jones then Michelle Williams) are growing up together. One girl’s father is never around, being a pilot, while her mother seems delightful—provided she has some valium. The other girl appears to be more grounded, and that sense of stability serves as a guide for “Marina” through what becomes an increasingly unconventional existence. Whenever "Marina" makes a mistake, "Holly" steps in to help. Eventually, though, it dawns on "Holly" that her own life is being absorbed into her friend’s. They even find themselves involved with the same men, intentionally or not. Now “Holly” has to figure out how to stand up for herself and build a separate life without her friend essentially destroying things. There are moments of genuine wit and poignancy, but the repetitive cycle of problems and setbacks, along with the fact that both women are difficult to like, didn't really help as the film progressed. The movie aims to explore complicated issues—not only substance abuse involving alcohol and pills, but also a dependence on affection beyond just romantic relationships. However, in reality, it’s an unclear and unfinished examination of two people who aren’t particularly engaging, surrounded by men who all seem equally deserving of each other. There's too much talking, and after a while it simply blends into a general sense of ordinariness. It wasn't for me.

Source on TMDB