London's Slough House is where disgraced MI5 spies go to while away what's left of their washed-up careers. Maybe they messed up an op badly and can't be trusted anymore. Maybe they got in the way of an ambitious colleague and had the rug yanked out from under them. Maybe they just got too dependent on the bottle--not unusual in this line of work. But they have one thing in common: they all want to be back in the action. And they'll do anything to...