Here's today's question: in a mystery, which element is most important?
I know, I know: it's impossible to choose one. But just for fun, consider which element an author should work on most carefully. Plot? Character? Setting? Irony? Tone? Something else?
I actually have a pretty strong opinion on this one, and I'll express it on Monday, but (being a fair, open-minded sort) I'm willing to hear what everyone else thinks first. But be prepared for an argument!