This is a very good and very thorough book (744 pages!). I had a chance to proofread the book for Peter during the writing process, and I can tell you that this is the complete reference guide to all aspects of computer virus research. It's well written, entertaining, very technical and even controversial at places. It is the best book on viruses I've seen.
From the back cover: "Szor presents the state-of-the-art in both malware and protection, providing the full technical detail that professionals need to handle increasingly complex attacks. He also offers the most thorough and practical primer on virus analysis ever published—addressing everything from creating your own personal laboratory to automating the analysis process."
We've known Peter for years (he used to work for us in the 1990s), and he's one of the best virus researchers in the world. We recommend his book for everybody interested in viruses.