Tatum plays a guy named Martin who's married to Mara's character Emily. Martin just got out of prison for insider trading when Emily's depression flares up again causing some serious stuff to go down. Her psychiatrist Dr. Banks is played by Jude Law. As he's treating her, he gets in touch with her previous psychiatrist Dr. Siebert. Emily's depression continues to worsen as she experiences sleep walking as a side effect of her medication. I won't spoil the movie, but she does something very bad and gets in trouble with the law. Dr. Banks helps her out, but afterwards something just doesn't seem right. He starts investigating which leads to a huge twist in the movie.
If you are good at guessing the twists and turns of movies, I challenge you to try this one. It's an interesting plot with pretty good acting besides that of Tatum, unfortunately. He's hot, but he's not really ready for a serious film.