I'm outlining a new book that will essentially be a non-murder mystery, and I'm seeking out how some other authors have used mystery elements in what is basically a literary novel. What are some books that I can take a look at where the MC is solving a mystery, but perhaps one that is non-murder related or even non-criminal in nature? I'm sure there are some obvious ones I've read and not even realized would fit in this category, so throw out whatever comes to mind.