Autumn 1941, Shanghai occupied area. Military agent Ye Wenyuan lurked in the Wang Puppet Secret Service headquarters for three years, codenamed "Shadow." Every night he took off his smiling mask and delivered information on the tip of a knife. Tonight, the contactor sent a top-secret list - there are "Sparrows" from the underground party of the Chinese Communist Party within the Wang puppet, and the Japanese military's special high school is hunting them all over the city. But he didn't know that the undeciphered message on his desk pointed to his true identity.
