Her father has been framed, and the grain tribute shipment is on the verge of being delayed. Shen Lingyi takes his place and is given three months to deliver it to the capital. But as soon as she sets out by water, river bandits attack her boat. More than half the crew are killed or wounded, and the grain sinks to the bottom of the river. Using an exquisite pair of dice as her token, she infiltrates the Grain Transport Guild to audit its accounts, only to discover a shocking embezzlement scheme hidden in the ledgers: someone in the court has colluded with river bandits to sell off government grain, then report it as lost in shipwrecks. While tracking down the mastermind, Shen Lingyi works to repair the damaged transport routes, relying on the connections her father left behind and her extraordinary skill with accounts to proceed step by step. But she never expected her greatest rival to be the very man she is betrothed to, the commander of the Embroidered Uniform Guard. Ordered to investigate the case, he blocks her at every turn, as if protecting someone. When the secret of the exquisite dice is finally revealed, she realizes that this upheaval in grain transport is merely one move in a game of power at court.
