The Public Security Bureau intercept a telegram notifying foreign agents to retrieve the "110 secret". Shi Yan, head of the Reconnaissance Section, starts a campaign of counter-espionage, but one of his agents is soon killed on board a train.
| Directing | Fangqian Chen | Director |
| Directing | Liu Chunlin | Director |
| Art | Zhang Jinbiao | Art Direction |
| Editing | E Yan | Editor |