The cat and mouse game between government agents and a spy ring that has taken secret documents from a plane crash in Germany, not far from an US military research centre.
The Ipcress Filespy
Funeral in Berlinspy
Billion Dollar Brainspy
The MacKintosh Manspy
A Most Wanted Manspy
The Spy Who Came In from the Coldspy
Dr. Nospy
From Russia with Lovespy
The Quiller Memorandumspy
Tenetspy
Tinker Tailor Soldier Spyspy
The Living Daylightsspy
Red Joanspy
Quantum of Solacespy
Modesty Blaisespy
The Black Windmillspy
The Falcon and the Snowmanspy
Ice Cold in Alexspy
The King's Manspy
Page Eightspy
Mission: Impossiblespy
Top Secret!spy
Bunny Lake Is MissingSame genre & era
Spies Like Usspy