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I would definitely avoid Tooth and Nail - it's already heavily overused. I confess, all three titles sounded very generic and indistinct to me. They tell me this is an action-packed thriller, but ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/4017 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/4017 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I would definitely avoid _Tooth and Nail_ - it's already [heavily overused](http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=tooth+and+nail&x=0&y=0). I confess, all three titles sounded very generic and indistinct to me. They tell me this is an action-packed thriller, but nothing more specific than that. I'd recommend you consider what you find to be the most interesting, important, and/or unusual elements of your book, and try to construct a title referring to one or two of those (even if the reference oblique, it's still individual!). Of the three, _Hang Fire_ stands out most for me, but I would really consider it worthwhile to look for something a little less generic - a title that applies to your book, that wouldn't apply as easily to scads of others. Without knowing more about your book - central themes, conflicts, characters, motivations, location - I'd have a tough time recommending anything suitably tailored to your particular work. Here's an [article on title-choosing](http://www.writing-world.com/fiction/titles.shtml) you might find helpful.