Memory (2017)

Crystal lives with her mentally unstable brother John. John killed Crystal's husband years ago, but thanks to a very strong medication he now can live under his sister's guardianship. Yet, he becomes more and more aggressive towards Crystal who believes that it is due to reminiscences of his crime. She thus has to fall back on a hypnotist to change John's memory. But as the hypnotist works with John, she discovers that the truth is way more complex than the official story.