The story takes place in Shanghai in a parallel time and space. In 1944, one year before Japan surrendered, a thunderstorm suddenly fell one day in the Shanghai Concession, and a huge sinkhole appeared at a construction site. Many curious workers explored but never came back...
Only a few thin shells similar to insect eggs were left at the scene. Concession policeman Long Xuan was ordered to conduct an inspection, which actually led to a series of murders. During this period, he always had the same nightmare, dreaming of a boy who accidentally encountered a rotten sealed door in a damp cave, and then collapsed there...
During the in-depth investigation, Long Xin gradually discovered that her family seemed to have buried many unknown secrets. White moving bugs frequently appeared at the scene of murders. Her father, housekeeper, and sister had hesitated to speak to her several times and had reservations. Long Xuan had no choice but to pursue the truth in his own way...
However, the truth is sometimes so cruel and bloody.