As Sherlock said the word, sand, with obvious glee in his voice, John continued to stare at him with that confused look which seemed to greet most of the obvious solutions with which he presented people.
"All you have to do, in order to solve this, is to ask yourself, 'Where can I play beach volleyball in London?'" Sherlock said with annoyance. "As even the most dull-witted Londoner can attest, there aren't *that* many locations!"