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Homicide detective Tracy Crosswhite has returned to the police force after the sensational retrial of her sister’s killer. Still scarred from that ordeal, Tracy is pulled into an investigation that threatens to end her career, if not her life. A serial killer known as the Cowboy is killing young women in cheap motels in North Seattle.

At MI5 headquarters Regent's Park, First Desk Claude Whelan is learning the rule (cover your arse) the hard way. Tasked with protecting a beleaguered prime minister, he's facing attack from all directions himself. Over at Slough House, the MI5 satellite office for outcast and demoted spies, the agents are struggling with personal problems: repressed grief, various addictions, retail paralysis, and the nagging suspicion that their newest colleague is a psychopath. Plus someone is trying to kill Roddy Ho.

What happens when an old spook loses his mind? Does the Service have a retirement home for aging spies who can no longer remember their secrets are secret? Or are senile spies taken care of in a different, more permanent fashion? These are the paranoid concerns of David Cartwright, a Cold War–era operative and one-time head of MI5 who is sliding into dementia, and questions his grandson, River, must answer now that the spy who raised him sometimes forgets to wear pants. But River, himself an agent at Slough House, MI5’s outpost for disgraced spies, has other things to worry about.

Dieter Hess, an aged spy, is dead, and John Bachelor, his MI5 handler, is in deep, deep trouble. Death has revealed that the deceased had been keeping a secret second bank account - and there's only ever one reason a spy has a secret second bank account. The question of whether he was a double agent must be resolved, and its answer may undo an entire career's worth of spy secrets.