Slough house / Mick Herron.

"At Slough House-MI5's London depository for demoted spies-Brexit has taken a toll. The "slow horses" have been pushed further into the cold, Slough House wiped from Service records-and fatal accidents keep happening. No wonder Jackson Lamb's crew is feeling paranoid. But are they actually targets? With a new populist movement taking a grip on London's streets and the old order ensuring that everything's for sale to the highest bidder, the world's an uncomfortable place for those deemed surplus. The wise move would be to find a safe place and wait for the trouble to pass. But the slow horses aren't famed for making wise decisions. And with enemies on all sides, not even Jackson Lamb can keep his team from harm. Slough House is the perfect entry point for new readers to discover the thought-provoking, timely, and devastatingly entertaining world of the slow horses"--