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Slow Horses
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Jack Lowden as River Cartwright stands indoors in a dark jacket, looking to the side, with large glass windows and a cityscape in the background in a scene from Slow Horses. The outcasts of MI5 Jackson Lamb in Slow Horses Slow Horses
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Jack Lowden as River Cartwright stands indoors in a dark jacket, looking to the side, with large glass windows and a cityscape in the background in a scene from Slow Horses.
Jack Lowden plays MI5 agent River Cartwright A scene from season four of the British espionage series Slow Horses (2022ā€“ ).

Slow Horses

British intelligence thriller TV series
Written by
Shatarupa Chaudhuri
Shatarupa Chaudhuri is a deputy managing editor at Encyclopaedia Britannica, bringing over 15 years of editorial experience in news media and publishing.
Shatarupa Chaudhuri
Fact-checked by
Britannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
Britannica Editors
Last updated
ā€¢History

In a cramped, crummy office tucked away in an alley near Londonā€™s Aldersgate Street, a band of MI5 agentsā€”discarded from the agencyā€™s elite ranks but not dismissedā€”grinds through tedious administrative work and other humdrum tasks. Motley though the group is, its members have one thing in common: They made a blunder or committed an offense during their MI5 careers for which they have been cast off from the team of security service agents at the...

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