While Mao Mao is visiting the pleasure quarters to enjoy a well-deserved few days of rest with her father, she is once again drawn into an investigation! Indeed, a courtesan and her client were found poisoned in one of the surrounding brothels... A case that the young apothecary manages to solve with great composure.
But, back at the Jade Pavilion, the young girl is tasked by Jinshi to clarify an entirely different mystery: the body of an inner court maid has just been discovered in the icy waters of the moat...