1上元夜鬼脉初现天宝三载,上元灯夜长安城一百零八坊华灯如昼,朱雀大街人潮涌动。林玄青提着医箱从崇仁坊匆匆穿过,空气中飘着胡麻饼的香气与酒肆传来的琵琶声,他却无心流连。太医院今日接连收治了三位怪病患者,症状如出一辙:面色青黑,脉象忽疾忽