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Blake Crouch is the only science-fiction writer I will read with any regularity. That is because his plots and subject matter are never ridiculous. That is more true of UPGRADE than of any of his other books that I've read. He succeeds in making his main character and narrator sound like a scientist when he talks about genealogy and DNA.

Logan lives happily with his wife and child and never wishes for more. He is a scientist but now works as a special agent for the Gene Protection Agency. It is his job to find and arrest anyone who tries to modify genes.

On one of Logan's raids of a "dark gene lab," he is impaled with a virus that will upgrade his own genes and make him an almost superhuman. He discovers that this was a deliberate plan of his previously-thought-dead mother, also a scientist but far more brilliant than he is.

What follows is Logan's adventures as he attempts to prevent his mother and then his sister from infecting the world with this virus. They feel that the human species can only be saved by this upgrade. But Logan knows that he can't stand by and watch millions die from the virus's negative effects.

This all happens in the 21st century, only a few years from now. Crouch could be implying that this is something we need to worry about but warns that "it's not nice to fool Mother Nature" (which you may remember if you're old enough). He could also be saying that our intelligence doesn't need to be upgraded. Maybe his final letter to his wife and daughter explains it.