The Foreign Office at Whitehall was a fortress of bureaucracy, its grand corridors echoing with the hurried footsteps of clerks and the distant, rhythmic ticking of a hundred grandfather clocks. We were granted entry only by the direct authority of Mycroft’s signet ring, and even then, the atmosphere was one of frigid suspicion. The Under-Secretary, a man whose skin looked like yellowed parchment, led us into a vaulted archive room where the scent of old paper and beeswax was overwhelming.
"The Count’s itinerary was a state secret," the Under-Secretary insisted, his voice trembling as he gestured to a series of heavy, leather-bound ledgers. "Only three men in this building knew he was headed to the Diogenes Club. To suggest a leak is to suggest treason at the highest level."
Holmes ignored the man’s indignation, his hands moving through the stacks of diplomatic correspondence with a speed that defied the eye. He was looking for something specific: not the treaty itself, but the trail of its movement. Suddenly, he froze. He pulled a single, thin sheet of carbon paper from a tray labeled 'Dispatched.'
"Observation, Watson, is the art of seeing what others merely look at," Holmes remarked, holding the paper up to the gaslight. "Look at the indentation on this ledger. A memo was drafted here three hours before the Count was murdered. It wasn't an official directive; it was a private note addressed to an anonymous box in Mayfair, detailing the exact time the Count would be alone in the club's silence room."
He tossed the paper back onto the desk, his face set in a grim mask. "The leak did not come from a spy outside these walls, but from a 'ghost' within them. Someone here sold the Count's life for a price, and they used the official diplomatic pouch to do it."