White, Fred Merrick: The Golden Bat. V1. 8 May 2012
 

Frederick Merrick White (1859-?) wrote a number of novels and short stories under the name Fred M. White, including the six 'Doom of London' science-fiction stories, in which various catastrophes beset London. These include The Four Days' Night (1903), in which London is beset by a massive killer smog; The Dust of Death (1903), in which diphtheria infects the city, spreading from refuse tips and sewers; and The Four White Days (1903), in which a sudden and deep winter paralyses the city under snow and ice. These six stories all first appeared in Pearson's Magazine, and were illustrated by Warwick Globe.
Wikipedia

Excerpt

The big clean-shaven man with the florid, humorous face and mobile lips would have passed anywhere for a barrister in prosperous practice, or perhaps, a cabinet minister, well-dressed, assured, and certain of himself, and it was his business to convey that impression, because Lytton Barle was head of the Secret Squad at New Scotland, a position not to be proclaimed on the house-tops