The Mountain Between Us, a disaster-romance directed by Hany Abu-Assad and starring Idris Elba and Kate Winslet, is immediately identifiable as a book adaptation (Charles Martin’s 2010 novel). It feels like a lurid-but-chaste paperback you’d find at a train station reading desk, or on your mum’s bedside cabinet. The cover image would be two handsome lovers, wrapped in ski gear, snuggled up against the warm glow of a cabin fire. In other words, the impression here is not of danger, or life-in-the-balance peril. The only real tension is wondering how quickly they’re going to bang. The mountain, in case you…