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The miraculous evacuation of almost 340,000 Allied soldiers while under constant fire from the advancing German Army has provided director Christopher Nolan with the subject for his most superlative film yet. Splitting the narrative into three strands - on the beach (Fionn Whitehead's teen squaddie), at sea (Mark Rylance's taciturn small boat captain) and in the air (Tom Hardy's clipped RAF Spitfire pilot) - he marshals the storylines into a visceral, compelling whole while providing a quality hitherto mostly absent from his work - genuine passion. It's a colossal, nerve-shredding effort and one where Nolan never puts a foot wrong.