You Won’t See This ‘Slow Horses’ Book Twist Coming

If you’re already swept up in the Emmy-winning phenomenon that is Slow Horses, you know that each season of the Apple TV+ hit follows a different book in Mick Herron’s series about a group of misfit M15 agents. Slow Horses Season 5 (which premiered on Sept. 24) is based on London Rules, which covers the suspenseful, twist-filled investigation into a string of terrorist attacks that have a surprising connection to the underdog unit. Want to take a peek ahead at this season’s mystery? Here’s the London Rules book ending and...