A dead man's unsold military certificate holds the fate of the entire border.
Shen Yanheng, a military book writer, was transferred to a border fort that was about to be dismantled. The river is closed in the harsh winter, food is scarce and soldiers are scarce. During the night roll call, a name that has been missing for three years is answered from under the ice. If the changing of the guard cannot be completed tonight and the city wall is deserted, if the roll call continues as usual, the living people will go to the old water gate.
Shen was able to identify abnormal relationships from the album pages, military uniforms and identity cards, but could not see the murderer and could not find the solution. In order for the five hundred soldiers and civilians to survive this winter, he had to first count the living people, and then find out the names of the dead who were still eating food, working on errands, and claiming their lives.
