Have you ever seen the movie 28 Days Later? It's the one where an environmental group frees some chimps that are infected with a rage virus and soon everybody's turned into crazy killers. Ray Garton's Frankenstorm is kind of like that, but there are differences.
For one thing the book takes place during the release of the infected instead of 28 days later. For another thing, the test subjects are homeless people instead of chimps. On top of that, the story is set in California during a hurricane.
This means that instead of being a zombie-esque horror tale, Frankenstorm is more of a horror/sci-fi/thriller. It's a good story with a great deal of conflict involving infected people, a militia, a mad scientist, a secret government black-ops organization, drug dealers, and a sheriff's deputy who's insane before being exposed to the virus.
The book also includes a bonus short story called "The Guy Down the Street." It's a disturbing little tale that I didn't find as enjoyable as the novel.
This book is just good fun, if you idea of fun involves lots of gore and violence.