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As mentioned, there are two other books in the Fifty Shades of Grey trilogy. While Universal and Focus haven't announced official plans to adapt the followups, It seems probable that they'll aim to make this film a trilogy. It's possible they want to wait and see how the first film does. In fact, Dana Brunetti recently said they haven't even started talking about whether or not they're going to do a sequel, and that they'll talk about that next year.
www.cinemablend.com/new/Fifty- Shades-Grey-Movie-What-We-Know-So- Far-42208.html
