I wanna get into detective/mystery/murder mystery books. (Not sure what they're called... books where there are crimes happening and there's a detective investigating everything) What are the must-read classics? And other recommendations? I prefer things with this old-fashioned aesthetic (old trains, fancy mansions, etc) but honestly anything that you think is good or would recommend also works. Don't be afraid of flooding me with lists, I want as many recommendationsaspossible.