This is a very pleasant book: it is a fast read and conveys a lot of nice information in a way that is very understandable.

Popular science writing is always difficult to pull off perfectly, and this book suffers from a lot of jumping around; maybe it was the author's way to try to keep readers from getting bored, but I found it a bit strange.

The book is dated 2002; I would love to see an update (maybe on the writer's blog, if he has one) with an update on the stories that were not concluded:

what was the final result of the Anthrax investigation? I have seen this article in The Atlantic: www.theatlantic.com/magazine/archive/2010/05/the-wrong-man/308019/ which might fill in that gap

the book came out before the second Iraq war, and it speculates on Iraq having smallpox; it would be nice to see the conclusion of that thread (probably: "none was found", but I have not researched it)