This is a great movie, especially if you love psychological thrillers.
The substance within the main, and most important, characters is consuming. Their growth within a small duration of time is definitely believable and the actors picked for the roles could not have been better.
The story is quite gripping especially if you have any knowledge (personal or otherwise) of domestic relationships, home violence & drug use..although with the latter, my in depth knowledge let me down as a couple of things were portrayed incorrectly. Not a big thing but something that could be improved upon.
There was a clear tough beginning, harrowing middle story and beautiful end. Being "Shut in" is a title to encompass the different ways characteristics are trapped within their own sins and addictions.
I was hoping some parts would be a bit more expanded upon, but I think that's a personal choice.
Thanks for making this wonderful movie. I'll watch it again soon.