Cliff Walkers follows 4 Chinese spies trying to reach the Japanese-dominated city of Harbin, where they should await for further instructions. However, the Japanese are aware of their plans, and send their agents to infiltrate and sabotage the mission.

This film has spies doing what they do best: handling information. The first scene has the protagonists split into 2 groups, with no radios or other ways to contact each other. In a following scene, when one of the groups learns that they're being watched, they must pass this information to their teammates without busting their identity. I... read the rest.