The week in theatre: Force Majeure; Folk " review
Donmar Warehouse; Hampstead Theatre Downstairs, LondonOne false move tears a family apart in a superb adaptation of Ruben Östlund's avalanche film. And folk song collector Cecil Sharp meets his match in Nell Leyshon's charming new play Force Majeure, Ruben Östlund's 2014 film, is, on the face of it, begging not to be adapted for the stage: it involves a majestic alpine landscape and skiing " and that's just f…