When 15-year-old Pedro Elias Garzon Delvaux realised an Associated Press photo of him at the Louvre on the day of the crown jewels heist had drawn millions of views, his first instinct was not to rush online and unmask himself. Quite the opposite. A fan of Sherlock Holmes and Hercule Poirot who lives with his parents and grandfather in Rambouillet, 30km (19 miles) from Paris, Pedro decided to let the mystery linger.