This is the 6th book in the Slough Horses series by Mick Herron and it was just as good as  the priors.  I do recommend reading them in order because they’re not like Agatha Christie series, Each book builds on the plot and characters of the prior book(s).  If you enjoyed the prior books you’ll love this one too.  They’re full of very interesting characters and twisty plots.  The language is not your normal run-of-the-mill genre book chatter and the humor is to lol for.  

Joe Country
By Mick Herron
2021 / 247 pages
Read by Gerard Doyle 11h 34m
Rating:  A / crime (spy)
(Both read and listened)

From the publisher via Amazon (to avoid spoilers): 
If Spook Street is where spies live, Joe Country is where they go to die. 

In Slough House, the London outpost for disgraced spies of MI5, memories are stirring, all of them bad. Catherine Standish is buying booze again, Louisa Guy is raking over the ashes of lost love, and new recruit Lech Wicinski, whose sins make him outcast even among the slow horses, is determined to discover who destroyed his career, even if he tears his life apart in the process. 

Meanwhile, in Regent’s Park, Diana Taverner’s tenure as First Desk is running into difficulties. If she’s going to make the Service fit for purpose, she might have to make deals with a familiar old devil….

And with winter taking its grip, Jackson Lamb would sooner be left brooding in peace, but even he can’t ignore the dried blood on his carpets. So when the man responsible breaks cover at last, Lamb sends the slow horses out to even the score.