It's hard to get excited about this ­adaptation of Philip Pullman's 1992 novel, a putative reworking of Romeo and Juliet set in modern-day Oxford. Hardworking teenager Chris rescues pouty waitress Jenny from thuggish aristocrat Piers at a ball, igniting an ­overwrought romance. It's all very "young adult", but fails to generate much screen heat. It's all just a bit ­­too safe.