The film is based on the actual events of the Portland Spy Ring trial in the U.K. A disgruntled Navy Clerk is transferred to a secret research establishment and is subsequently black-mailed/paid by Czech intelligence to procure secrets for them. He seduces the secretary who controls the most secret documents, and they enjoy the fruits of their treachery until the British authorities begin to close in on them.

The Quiller Memorandum
1966
5.9/10

Each Dawn I Die
1939
6.8/10

They Made Me a Fugitive
1947
6.6/10

Indemnity
2022
6.6/10

Time Without Pity
1957
6.5/10

The Locket
1946
6.3/10

Nancy
2018
5.8/10

The Blue Lamp
1950
6.6/10

Miss Marple: They Do It with Mirrors
1991
6.9/10

The Assault
2014
6.7/10

Tokyo Joe
1949
6.1/10

The Dark Past
1948
6.0/10

The Web
1947
7.1/10

The Glass Key
1942
6.6/10

M
1951
6.4/10

T-Men
1947
6.8/10

The Mask of Dimitrios
1944
7.0/10

Topaz
1969
6.0/10

Witness to Murder
1954
6.3/10

Man from Reno
2014
6.4/10
Little Nikita
1988
6.1/10