Slough House

Mick Herron's Slough House novels center on a group of disgraced (but not yet fired) MI5 agents who have been shunted off to a non-descript London office to perform low-level espionage work. This team of "slow horses" are generally forced to endure dull paper-pushing assignments, although occasionally an interesting case will fall into their laps. It's an inspired set-up, and one that allows Herron to create some truly unique characters, as well as a good amount of humor and mischievousness. His ninth full-length book in the series is eponymously titled Slough House, and involves a plot to murder members of Slough House itself. The Brexit/Russian story elements are a little too topical and certain parts of the investigation are perfunctory, but the characters and dialogue are quite strong.