The Apothecary Diaries, Volume 3 (by Natsu Hyuuga)

After breaking a 'curse' on the imperial heirs, a palace servant with training in herbal medicine is promoted up the ranks to food taster.and right into the thick of palace intrigue in this lushly illustrated period mystery series!After explaining to Jinshi the circumstances behind the poisoned cup at the garden party, Maomao returns home to the pleasure district for the first time in ten months, thanks to the ornate hairpin she received at the party. But there, she gets swept up in yet another mystery !