Three Black Triangles
Movie| Title | 黑三角 |
| User score | 7 |
| Release date | Jan 1, 1977 |
| Genre | Thriller, Action |
| Director | Chen Fangqian , Liu Chunlin |
| Production country | China |
| Production companies | Beijing Film Studio, Ningxia Film Group |
| Run time | 89 min. |
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.
