Slow Horses Season 5 won’t hit Apple TV+ until 2025, but you can check out the first trailer now

London Rules, the fifth book in Mick Herron's beloved series of spy novels, is a standout to fans like me for several reasons -- one of which is that it finally answers a lingering mystery I'm sure is bedeviling many fans of Slow Horses, the books' acclaimed Apple TV+ adaptation: Just how exactly did Jackson Lamb, the philistine HR nightmare of a spymaster, wind up on MI5's island of misfit toys known as Slough House?

Some... other things also happen in the book, which will form the basis...