Espionage: Isolated Island, 1939

In 1939, on the isolated island of Shanghai, criminal investigator Shen Wangyue opened his eyes to find himself a Chinese detective at the Central Police Station in the French Concession. A corpse lay before him, and he held half a page of notes in his hand.

A Chinese employee of Hashimoto Trading Company, Chen Maolin, had "jumped to his death." The case file was already closed, the Japanese were applying pressure, and his superior told him to keep quiet. Should he investigate or not?

A letter left behind by the deceased points to Number 13, Lane 1, Fuxi Road.

With the truth shrouded in layers of mystery, who is the mastermind behind it all?