Sherlock Holmes and The Dreadnought Cypher

London, 1914—as Europe stands on the brink of war, Britain's Royal Navy faces an unseen enemy. Someone has breached the Admiralty's most secret cipher, feeding Germany Britain's naval manoeuvres and turning the North Sea into a graveyard. Summoned by a desperate Mycroft Holmes, Sherlock Holmes and Dr Watson descend into the nerve-centre of the Cipher Bureau, where every wireless message could be a weapon and every clerk a potential traitor. When coded orders vanish, warships sink without warning, and a brilliant young cipher officer survives an attempt on her life, Holmes uncovers a chilling truth: the enemy's mole isn't merely bilingual—he is bicultural, fluent in Britain's language, poetry, and mind. From the fog-shrouded rooftops of the Admiralty to the wind-lashed Baltic coast, Holmes and Watson pursue a master spy whose "phantom messages" can lure fleets to destruction. But as clues point to a buried key, a murdered telegrapher, and a ruthless German agent known as Colonel Kroll, Holmes realises that the war's first battle is being fought not in the trenches but in the shadows—code against code, intellect against intellect. Brimming with authentic World-War-I atmosphere, high-stakes espionage, and the razor-edged deductive duels that made the Great Detective legendary, Sherlock Holmes and the Dreadnought Cypher is a gripping historical mystery where the survival of an empire may depend on breaking one final code.