If you liked Sherlock Holmes, then you will probably enjoy the Solar Pons series by August Derleth. IIRC, most are short stories.
Mysteries written by Georges Simenon - He wrote the Inspector Maigret series (and other mysteries of his) in French, all have been translated to English. They are only around 200 pages each, and there is also a collection of Maigret short stories. Time frame is early 1900's, main area is Paris. His stories are like being there.
Not a mystery, but an enjoyable read favorite of mine, is Dickens "The Pickwick Club", also known as "The Posthumous Papers of the Pickwick Club". The beginning pages establish the purpose of the Pickwick Club, and its reason for being - to experience life, and document it (but do it on your own nickel
). It was written in the 1830's, but the people could be around today. The only part that drags a bit is the political chapter, the "Blues and the Buffs", but that part could describe American politics today to a T. A bit scary, actually, like he foretold the future.
It's a fast-paced adventure, never know what is around the next bend in the road.