"Joe Country" by Mick Herron

Still enjoying the Slow Horses book series, if enjoying blogging about them a bit less (as evidenced by the fact that I finished this one long enough ago that I'm already halfway through the next one). This is the one where Louisa takes PTO and decides to use it to find Min's son who has gone missing. 

Next season is coming out in less than a month. I found out this evening that it will be based on this book and the next!