From the liner notes

From master Italian auteur Dario Argento comes a new face of horror—Giallo. Adrien Brody (The Pianist) and Elsa Pataky (Snakes on a Plane) star as the last hope Turin has against a sick–minded serial killer.

Yellow (Giallo) chooses his female victims based on their beauty, the more beautiful they are, the more likely they are to be kidnapped. Yellow toys with them, abuses their mind and body, and then kills them. And he's clever too, only going after tourists, women who won't find an advocate in the police department. His latest victim is Celine (Elsa Pataky), a gorgeous American fashion model. Her sister Linda (Emmanuelle Seigner), along with help from an FBI agent (Adrien Brody), embark on a dangerous pursuit of this mysterious predator. As Linda and the detective close in on Celine, a chance encounter with Yellow puts Linda on his radar, and now he yearns to kill her as well. Both sisters are in jeopardy, and the clock is ticking.