Shen Qingci, daughter of the Marquis of Zhenbei, is sent as a hostage to the Prince Regent's manor, secretly carrying a military order from the border. Disguised as a delicate young lady, she maneuvers carefully at every turn. Using the purchase of winter clothes as cover, she secretly arranges grain supplies; she intercepts Prince An's secret letter and lays out her plans at court. She navigates the suspicious and ruthless Prince Regent Xiao Yan, the young emperor with hidden sharpness, and the many factions vying for power. She struggles to survive on the edge of a blade and safeguards her homeland within a narrow space, kindling the fires of hope in the northern frontier from inside her cage.
