London Rules might not be written down, but everyone knows rule one.
Cover your arse.
Regent´s Park´s First Desk, Claude Whelan, is learning this the hard way. Tasked with protecting a beleaguered prime minister, he´s facing attack from all directions himself: from the showboating MP who orchestrated the Brexit vote, and now has his sights set on Number Ten; from the showboat´s wife, a tabloid columnist, who´s crucifying Whelan in print; and especially from his own deputy, Lady Di Taverner, who´s alert for Claude´s every stumble.
Meanwhile, the country´s being rocked by an apparently random string of terror attacks, and someone´s trying to kill Roddy Ho.
Over at Slough House, the crew are struggling with personal problems: repressed grief, various addictions, retail paralysis, and the nagging suspicion that their newest colleague is a psychopath. But collectively, they´re about to rediscover their greatest strength - that of making a bad situation much, much worse.
It´s a good job Jackson Lamb knows the rules. Because those things aren´t going to break themselves.