RE: Deconstructing a Novel: Step 1
Having a random picker or random person make the decision is a great way for you to learn what you actually want. Happens to me all the time.
I'll be interested to see how this goes. I'm not a murder-mystery fan for the most part so I really don't have a lot of knowledge about the structure of a typical murder-mystery novel. This should be a good learning experience for me.