茸は毒にも、薬にも…。──そして、秋の味覚にも。
久々に隊商がやってきた後宮で、小蘭（シャオラン）と一緒に買い物を楽しむ猫猫は、そこで子猫を捕まえてくれた女官・子翠（シスイ）と再会します。そしてまたもや壬氏から新たな相談事を受けることになリますが、それが別の事件に繋がってゆき──…。

A festive atmosphere descends upon the Inner Court with the arrival of a long-awaited merchant caravan and its myriad wares. Though the excitement is contagious and even Maomao looks forward to making purchases of her own, she soon cottons on to something potentially sinister about the innocuous goods for sale.
Before Maomao can tease out any evidence, however, her attention turns to mushrooms when Jinshi asks her to root out any poisonous varieties on the grounds. But is this request just a bit of landscaping or does it have anything to do with the rumors making the rounds about a court lady who has gone missing?