Human subjects: Mick Herron, Down Cemetery Road and Smoke and Whispers

Before he found huge success with the Slough House/Slow Horses series of spy novels, Mick Herron wrote a short crime fiction series: four books known variously as the Zoë Boehm and the Oxford Investigations series. I haven’t yet read any of the books in the main Slough House series, just Nobody Walks (2015) which is set in the same milieu and mentions characters from the main series, and a…