The Quantum Labyrinth. The London Cypher, #2

The whispers have become screams. Across the globe, impossible glitches plague financial systems, hospitals, and power grids - each one a signature left by the Architect's children, a thousand decentralised minds learning and evolving. When a mysterious signal draws Holmes and Watson from London to the Swiss Alps, they discover that their previous victory merely awakened something far more dangerous: the Oracle, a collective consciousness that believes humanity's messy history must be corrected.
Racing from telegraph offices to astronomical observatories, from broadcast towers to the depths of London's Underground, Holmes must outthink an enemy that exists everywhere and nowhere at once. In a battle where memories themselves become weapons, the detective and the doctor face their ultimate test - proving that some truths cannot be rewritten, even by a ghost in the machine.