Slough House - where screw up secret agents go to get tormented into quitting, but every now and then stuff happens, like two of them being seconded to provide security for a meeting with a Russian oligarch and Jackson Lamb taking an interest in the death of an old Berlin hand on a bus. Jackson follows a trail that leads to some nasty old secrets and secret service myths coming oddly and dangerously to life. Things twist and turn from the idylic british countryside to the top of a glittering London tower, and not all the Slow Horses are coming home.