In the modern city E, a private reasoning team's "mystery compilation" mechanism was established to accept commissions for various types of suspense cases. With the mastermind Zhou Wenhe as the axis, the team brings together former criminal police officers, hackers, forensic doctors, detectives, intelligence agents, lawyers and other diverse backgrounds to break through themselves in collaboration and both cooperate and compete with the official police. The whole series is intertwined: the main line focuses on the chain of old cases and the mysterious organization "Prism" hidden behind several shocking unsolved cases, while the sub-line intersperses ordinary people's requests for help and the description of gray areas in society. Multiple story lines are intertwined and advanced. The team members gradually analyze themselves and grow during the investigation, and gradually uncover the unspeakable truth under the shadow of E City.
