Best New TV Shows of September 2026

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.

Power is up for grabs as two warring crime families clash in a battle that threatens to topple empires. In the crossfire stands Harry Da Souza, a street-smart 'fixer' who knows too well where loyalties lie when opposing forces collide.