Kiera Knightley and Sam Worthington play a well-to-do couple tempted into adultery. She’s a journalist. He works for a property company. His rival is Gullaume Canet, a writer. Eva Mendes is the alluring femme fatale who does indeed lure. The film aims for maturity and complexity but fails and feels rather inept. Worthington is charmless. Knightley is almost good but not quite. The film seems prudish both in what it shows physically and what it depicts psychologically and verges on the dishonest. It doesn’t look good enough either and Mendes and Knightley are sometimes shot in what seem to be their worst angles: Mendes with a bottom-heavy face, all round cheeks; and Knightley with an almost masculine, heavily delineated jaw-bone. Last Night aims for louche glamour but just feels a bit cheap.