Tom Hardy is brilliant but this was a massive let down. Historically inaccurate, lacking in suspense, lacking in originality and clunky at best.
One woman takes revenge against her captors that is both exhilarating and borderline plagiarism. One of the end shots is a like for like copy of Luc Bessons Leon and the director (judging by the interview on the extras) wants to be Tarantino and tonally it's very uneven. It's both comedic and harrowing and unsure whether it wants to be cool or exploitative. However it is a blast and great fun if you suspend disbelief.
Plus points are the handling of the mother daughter scenes and the (almost) one location setting.
One of those no budget Sci-Fi mind benders similar to Primer or Another Earth whereby the dialogue and situations matter far more than using FX.
A comet passing above the earth (barely glimpsed) causes alternate realities for a dinner party in suburbia with 4 couples. Almost all of the film is set within one house but the film builds like a jigsaw puzzle with no actual picture at the end. Impressive.