Special Cases: No Crossing the River of Oblivion

[Primarily a mystery, with subtle supernatural elements; no CP, no romance; serious tone]

A string of major cases strikes Jiangcheng. Every one of them seems connected to a police scandal from years ago… Is it the vengeful spirit of the dead, or has someone from the past returned?

The heavens see all. If every restless soul could return to the world of the living and clear their name, would the darkness in this world truly have nowhere left to hide?