This installment in the Nick Lupo series does have a bit more edge to it, just as the title suggests. And that's a good thing! I was afraid author W.D. Gagliani might wrap up the series with this, the fourth book, but apparently not. Without being too much of a spoiler, let's just say the novel builds to a thrilling yet satisfying climax, followed by a bit of a cliff hanger in the denouement.