In 1907, two years after the publication of the paper, Einstein changed the first formulation L=mV² to E=MC², the most famous equation in physics. Over the next decades the esteem, even reverence, accorded this remarkable scientist, stemming from the Annus Mirabilis of 1905, became unstoppable. Had Holmes revealed his deduction to the world at that time, that this Newton incarnate had fathered an illegitimate child who was then subjected to a mercy-killing, it is no exaggeration to say that rather than ending Einstein’s career before it had begun, Holmes and Watson might themselves have become objects of derision, even of dangerous hatreds.
Holmes’s and Watson’s experience in Serbia was far from wasted. What they learnt in the search for Lieserl was to be of extraordinary value when, hardly a year later, at the behest of a British Prime Minister, Holmes and Watson paid a second visit to Constantinople, the capital of the Ottoman Empire, on a most secret and sensitive mission. The ‘Sick Man of Europe’ was collapsing. Once again the Sword of Osman had gone missing. Was an uprising against the Caliph in the offing? With what consequence for Britain’s interests in the Middle East and India? And what devious part was Mycroft about to play in the proceedings?