Salt (movie, 2006)

When she learns the disturbing nature of her abusive husband's extramarital affair, Phoebe and her sister-in-law-turned-mistress, West, devise a playful revenge plot that quickly devolves into a conspiracy to commit murder. Writer-director Bradford Tatum stars in this dark and twisted contemporary noir thriller as Phoebe's despicable husband, a paranoid artist named Randal.