In the spring of 1942, in the "Jishengtang" traditional Chinese medicine shop in the occupied area of Shanghai, apprentice Chen Yanqing weighed medicines and prepared prescriptions every day. No one knew that there were disassembled transmitter parts hidden in the mezzanine of the medicine drawer he organized. The bitter aroma of angelica masked the smell of metal and electricity, and also concealed his secret mission of delivering intelligence to Northern Jiangsu late at night. Until one day, an unsigned warning note was inserted into a package of angelica.
