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In 1896 London, private enquiry agent Cyrus Barker faces a dire threat when his presumed-dead nemesis, Sebastian Nightwine, resurfaces, launching deadly attacks on Barker and his allies. Amidst this turmoil, Barker and his partner, Thomas Llewelyn, are tasked with locating Dr. Sun Yat-Sen, a Chinese reformer targeted by the Imperial Qing Secret Service. As they navigate a web of danger involving British and Chinese forces, the stakes rise, putting them in peril like never before.