Someone Is Watching You (2007)

Four people bound together by friendship, love and obsession witness a crime. The victim is a well-known socialite, and hers is the third recent murder to shock the city in which our story is set. Before this most recent death, the mysterious disappearance of a sophisticated businesswoman was being closely followed by both the police and the media. According to their investigations, a psychopathic serial killer is thought to be choosing beautiful, independent and wealthy women as targets. These women were all murdered according to the same modus operandi: a deep, straight cut to the heart. The police try to gather evidence that would help them discover the identity of this psychopath. In the meantime, everyone is a suspect. Slowly, the circle closes in on the most likely of the suspects, cornering them. Yet only one of them is the killer, and, as days go by, the time will come when his true identity is revealed.