The Slow Horses. It is neither a house nor is it in Slough but as the joke about the etymology of the name goes a discussion and gossip between spies that runs. The Slow Horses get ready to run.

A team of British intelligence agents who serve in a dumping ground department of MI5 - Slough House. Then the bodies start to pile up. This team of MI5 agents is united by one common bond.
This team of MI5 agents is united by one common bond.
One character might be on lets say level 1 at some point before they move to level 3 or 4 whilst other characters might be on other levels. Slow Horses concentrates on the doings of Slough House a dead end dumping ground for disgraced and flunked MI5 spooks and their arch washout the torpid Jackson Lamb a burnt out field operative who supervises from a gloomy garret of an office on the top floor. But when a young man is kidnapped they realise they cant just sit on the side-lines. The first three books in the series are being re-published prior to the release of the fourth Spook Street which comes out in February.