Review of "Slow Horses" by Mick Herron

I'd seen the TV series first and loved it, but was still able to enjoy the book. It's mainly straightforward spy-thriller fiction, though every so often there is a little flash of stylistic excellence. There a few minor differences from the series, and in almost every case the book is more cynical and nastier about the security services - and the TV series was already pretty nasty. Very good, very subversive.