Honestly I thought the woman was going crazy and killed her husband and stuffed him in the wall but the way everything played out was excellent. Good acting and a really clever story. I love foreign movies and deal with subtitles all the time, but the clock through me off and for some reason thought this took place over a matter of days instead of 1 night, but that's my fault.
7/10
*SPOILERS*
I liked it all the way up until the husband came back into the picture. I found his character and the explanation for his absence really underwhelming and unsatisfying.
I liked the mystery that they built and I really liked the idea of understanding their relationship through third parties (like the police, her lover, the drug dealer, etc). I'd give the first 80% of the movie an 8/10 and the last 15 minutes a 4/10.
Honestly I thought the woman was going crazy and killed her husband and stuffed him in the wall