I am giving 5 stars for the acting, without question. But all the hype surrounding this as comparable to Broadchurch, which had a major, major plot twist at the end, and had more episodes, among other things, is silly. This is an utterly terrifying depiction of how someone can be trapped in an abusive marriage with no way out, but death.
The domestic violence depicted here is utterly terrifying -- I was expecting to see a public service announcement at the end about how to get help, and there was none, which is a real shame!
I watched this in the U.S. through Acorn TV.