Do you like the name “The Flaming Sword” for a crime/mystery book?

I would shy away from the word flaming in a book title. That word has several meanings and some of those meanings may be undesirable for your title. “The Sword of Death” sounds better to me, or “Sword of Fire” perhaps.

It’s a good, catchy title but honestly the title must in a way correlate to the overall theme of your novel or short story. If your theme has something to do with it symbolically then its a perfect title. I’m assuming its a children mystery novel, correct? Good luck in your book writing! 🙂