An everyday man has only three and a half days and limited resources to discover why he was imprisoned in a nondescript room for 20 years without any explanation.
There's a moment in the movie (can't really specify, watched it on TV) where the main character develops a relationship with a white rat/mouse that's pregnant. After the main character loses consciousness, he sees they have disappeared and their captors feed the rat/mouse and the baby to him. Really disturbing for me. If you see him starting to share his food with a small white rat don't watch for approx 5 minutes or maybe a little more.