For three hundred years, the Great Jing dynasty has weathered one storm after another. The Ziwei Sword Manual, unearthed from the shifting sands of the Western Regions, conceals a secret that could overturn the imperial court. Beyond Yanmen Pass, Qingxu, head of Wudang, and Ye Cangming, leader of the Demonic Cult, meet their end. Beneath the black cloth shrouding their corpses, the sword manual's whereabouts become a mystery. The Shadow Pavilion, the Zhenwu Bureau, and the various martial sects all spring into action, as blood-red sandstorms sweep across the frontier.
Three days later, amid the misty rain of Jiangnan, Qingxu's sole disciple, Shen Yan, carries half a jade token. In the lantern-lit shadows of Pingjiang Road in Suzhou, he encounters Su Wanqing, who carries a basket and embroiders a Ziwei flower. A red cord is tied around her ankle, holding half a silver lock, while the jade hairpin in her hair bears a pattern that matches the token. She may not know that the other half of the sword manual lies beneath the three-hundred-year-old Ziwei tree in the rear courtyard of the Imperial Weaving Office. Nor does she know that the blades and bloodshed on the frontier have already followed the sandstorms to Jiangnan's stone-paved lanes.
When the Shadow Pavilion's compass points toward the jade token and Zhenwu Bureau agents knock at her door, the fates of the young man and the embroiderer have already been swept into the struggle between good and evil, the imperial court, and the destinies of two generations. The road through the martial world is long, and calamity is inescapable. Yet the sword manual that has set the whole realm in motion is only the prelude to an even greater storm.