Secret Drawings (1965)

A technician goes to a business trip but carrying secret drawings with himself, this behavior is totally contravening the regulations. And the secret drawings get lost at the railway station platform through a moment's inattention. Police inspector Shi Yun recuperating in hospital returns to the investigation mission immediately. She leads the information and evidences to the exact criminals and enemy spies with the help of colleagues and civilians, takes back the secret drawings and eradicates the spy ring ultimately.