I posted this last month,
`Deeds Of Darkness, book 4 of a set from Edward Marston.
https://www.goodreads.com/series/64405-home-front-detective
Set during World War 1, it focuses on Inspector Marmion and detective Keedy, trying to solve Murders in and around London. I've mentioned Marston before, for his Railway Detective series
https://www.goodreads.com/series/122037-the-railway-detective
Sometimes he gives you the killer on page 1, but most of the time he throws in so many red herrings, you have no idea who is responsible for the crimes until the final few pages.'
But it's out of date, as I have finished the Home Front series, and am on with book 2 of the Bow Street Rivals series
https://www.goodreads.com/series/152044-bow-street-rivals
Depends what you like to read, Atheist...