The new spy master . . . If Slough House on Aldersgate Street EC1 really existed it would already rival the Old Curiosity Shop on Portsmouth Street WC2 as a landmark of literary London . . . Herron has read his Carl Hiaasen as well as his Charles Dickens. The coruscating cynicism and cartoon comedy do not detract from the seriousness of the message: ‘Hate crime pollutes the soul, but only the souls of those who commit it.’