Spy film set in southern Vietnam after liberation. Thach Thao befriends
Thanh, the son a police official, so she can easily pass police posts. She
persuades her former boyfriend’s sister to emigrate illegally. The police begin
to suspect her as a spy. Using the code-name K213 she has returned from
abroad to contact counterrevolutionary groups masquerading as religious
organizations. After a battle, the police arrest all the plotters.