Follows a team of British intelligence agents who serve as a dumping ground department of MI5 due to their career-ending mistakes.

Slough House is a dumping ground for members of the intelligence service who've screwed up: left a service file on a train, blown a surveillance, or become drunkenly unreliable. They're the service's poor relations. The slow horses and most bitter among them is River Cartwright, whose days are spent transcribing mobile-phone conversations. But when a young man is abducted, and his kidnappers threaten to behead him live on the Internet, River sees an opportunity to redeem himself. But is the victim who he first appears to be? And what's the kidnappers' connection with a disgraced journalist? As the clock ticks on the execution, River finds that everyone involved has their own agenda.—tt

Jackson Lamb runs the MI5 division at Slough House. His team is known within MI5 as the Slow Horses: they're all there because they bungled an operation or were generally seen as unfit for front-line duty. It's either Slow Horses or leave the service. Despite their deficiencies and problems they prove themselves very resourceful.—grantss