Shadow Box by Scott Kelly is very definitely an action novel. The action never stops and it is never obvious what is going to happen next. Author Kelly might have read advice to authors that said: “Don’t tell, show.” And Kelly does that to such a degree that sometimes I wanted Kelly to tell me something. I never felt I knew what was going on throughout the entire novel. So, if you like mysteries and if you like to engage with your novel, this is the book for you. The only drawback is that this is part of a series. Yes, there is a conclusion to this novel, there is not a cliffhanger. But if you like the characters, you will want to read about the future adventures of some of the characters.