When a minor adventure up the spire of Salisbury Cathedral makes Günter Glass a local celebrity, John Blades - window-cleaner to the stars - comes calling. He wants Günter to join him in London to clean Europe's tallest skyscraper, the newly constructed Shard in London Bridge. Günter soon finds himself among the bright lights of London but will his innocence put him on a collision course with the frequently baffling modern world?