The Renji Mystery

The cyanide solution in a penicillin bottle unraveled a string of murders. Cheng Moqing discovered that Japan's Unit 731 was engineering a cholera vaccine failure. In the autopsy room, he cut open the stomach of a Japanese colonel's corpse with a scalpel and retrieved a miniature roll of film soaked in formalin. In the end, he slipped a forged epidemic report into the file box of the League of Nations investigation team. The thermometer in the morgue's refrigerated cabinet was actually the detonator for an opium warehouse at the docks.