The story takes place in the modern large city "Canglan City". Five talents with different backgrounds accidentally gathered together due to an unsolved serial kidnapping case to form a private cooperative investigation team. As various major suspense cases occur frequently in the city, the team focuses on complex mysteries and faces pressure from the police, media, society and other parties: it must not only rescue the victims and restore the truth, but also contend with its own psychological dilemma and value conflicts. From serial cases to each person's "private mystery", team members gradually deepen their personal growth, and the network of urban evil continues to expand, eventually revealing a dark force that controls the overall situation. Under the ten-volume structure, each volume focuses on one or two cases, and the story lines are intertwined and advanced. They are independent of each other and gradually piece together the overall criminal picture of Canglan City.
