on Writers Helping Writers:
Setting is a story element that must do double duty in any genre: it’s your backdrop, so it shouldn’t take over and become the story, but it should be chosen deliberately and used to both enrich and amplify your scenes. It should blend in and be influential.
But this is especially true in mystery novels where the setting can limit suspects, suggest motives, provide clues, and shape the crime. So, let’s look at some different options for setting in mysteries.