Slough House is an administrative purgatory for MI5 service rejects who have seriously failed a task but have not been sacked. Those consigned there are known as "slow horses", a play on the name of the place itself, Slough House, and an expression for people past their prime who are slow in thinking and action. Those assigned there are expected to endure dull, routine tasks, along with the occasional mental abuse from their miserable boss, Jackson Lamb (Gary Oldman), who expects them to quit out of boredom or frustration. Life in Slough House is defined by drudgery. Yet the slow horses somehow get involved in investigating cases important enough to endanger Britain.
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