"The Strange Case of the Four Demon Coffins" tells a story that happened in a remote county town in the Republic of China: The county's female detectives Sangeng and Qixi were ordered to conduct an in-depth investigation into a murder case, but gradually uncovered a strange murder case. The case also led to an old hatred from 20 years ago. As the case was unraveled, it became more and more confusing. The originally peaceful and tranquil county town is now shrouded in a terrifying atmosphere created by strange powers...