Suggest me a book similar to Sherlock and Hercule Poirot

Hi! I'm a big fan of both Sherlock and Hercule Poirot and those are some of my favourite novels/short stories.

I'm looking for something very similar and I hope to find books/short stories that:

Take place in 19th century or at the very beginning of 20th century. (Preferably in England)

And

Have interesting detective mysteries.

And I've also read all other Christie's books.

Thank you 🙂