In the late autumn of 1941, Chongqing shrouded in thick fog was filled with bloody undercurrents. The secret electrical fragments of the Japanese Army's "Fog Moon Project" triggered a three-way strangulation: Shen Moqing, the leader of the CCP's underground intelligence team, witnessed the tragic death of his comrades on the banks of the Jialing River; Fu Yunshen, a military cryptography expert, deciphered bloody gossip codes in the bombing ruins;
When Shen Moqing was forced to use the ancient book "Chu Ci" to convey information about cholera bacteria, he discovered that the contact person was actually a military officer who had been rescued during the Nanjing Massacre three years ago; Fu Yunshen deciphered the Morse code in his lover's suicide note and was shocked to find that the person beside his pillow was hiding the rose brooch of Agent No. 76. The fake wedding in the ringing of the church bells turns into a real killing scene, and the cipher script on the funicular is soaked in blood. Two espionage geniuses who bear the hatred of their country and family fall into a fatal choice amidst the roar of Japanese bombers.
