The F.B.I. (1965)

S04E01 Wind It Up and It Betrays You

When a hearing aid belonging to a deceased man is discovered to hold microfilm, the FBI stumbles upon a web of espionage and murder linked to Colonel Lorenz Tabor and Carl Schmidt. As they dig deeper into the case, the agents unravel a complex conspiracy that puts national security at risk, drawing them closer to the shadowy figures behind the illicit activities.