The wise and discerning Shen Lingyi was originally the wife of the heir of Changning Bo. As a hidden accountant, she is well-versed in ledger calculations and laws. At a family longevity banquet, her husband brought another woman back to the manor, intending to shake her position as the mistress of the house. Just as her father was wrongfully accused and awaiting trial, she immediately sealed the account books in the manor and protected her dowry. Relying on her superior wit and following the clues of the account books and the embroidery manual left by her mother, she joined hands with the junior magistrate of the Dali Temple, step by step pushing aside layers of mist, gathering key clues, and clearing her family's grievances. After going through numerous games of strategy, she broke free from the shackles of her old marriage, rallied a group of women, promoted institutional reform, and lived out a life belonging to herself.