Most of the tension in this film is created by trying to keep the clichéd plot points fresh as they unravel and inevitably teeter on the edge of going over the top. It's done pretty well and it looks good. It's got a little Michael Mann steely look. The set design is minimal and trés modern, the cinematography mostly dark with touches of yellow and gray filters, and the soundtrack nudges you along with obvious clues.
Five guys share a loft where they carry on their respective, perhaps, secret sexual affairs. Some are more committed to this scenario than others and all seems to be well until they discover a dead and very bloody girl in the bed. Who killed her, and why? Fingers start pointing and emotions run high. The story is presented through flashbacks and multiple interrogations so one is easily lead astray only to learn there's another side to the story as another deep dark secret is revealed. As soon as you think it's ho-hum, another shoe drops. The screenwriter must live in a Loft with a very big closet. The goodness of the twist factor here is achieved more through quantity than quality. This is not only a whodunit but a whodun-what. It just keeps going and going. It's formula stuff taken to the extreme.
5 friends who are all married and know each other very well decide to rent a loft together. In this loft they meet their mistresses. Everything is OK until one morning the body of an unknown young woman is found in the loft. The 5 friends begin to suspect each other of murder. And it becomes clear that they don't know each other as good as they always thought.