Chapter 21: Empress Zhangsun's Qi Illness Flares Up, Xiao Sizi Seeks Help! Over the past few days, the weather in Chang'an City had been like a giant, unvented steamer. Cicadas wailed endlessly in the treetops, grating on everyone's nerves. Not a breath of wind stirred, and the flowers and plants in the Imperial Garden drooped their heads, looking half-dead. Inside Lizheng Hall, the doors and windows were tightly shut. The old men from the Imperial Medical Bureau said the Empress was…