I know I saw this movie about 5 -6 years ago or so. I am pretty sure it’s foreign. It was about a woman who is being watched throughout the whole movie unbeknownst to her. I don’t remember there being much dialogue if any. She just basically lives her life and goes about it normally. Every once in awhile thinking she sees something weird but shrugs it off. Anyways at the end her and her friends are having a party of sorts in her apt. and the killer finally comes out kills her friends and then chases her around only to kill her at the very end. And then it just ends. I think I remember there being a scene towards the end with the killer in her garage murdering one of her friends. The reason I watched it was because Stephen King said it scared him and gave it good praise in a magazine i read once. I have Googled it and am unable to find anything about it. It’s been driving me nuts for years. Thanks in advance!