Blake Crouch delivers another high-concept sci-fi thriller that blends cutting-edge genetics with pulse-pounding action, though it doesn't quite reach the heights of his previous work. The story follows Logan Ramsay, a federal agent investigating illegal genetic modifications who becomes accidentally infected with a virus that dramatically enhances his intelligence, memory, and physical capabilities.

As Logan grapples with his transformation, he discovers his scientist mother Miriam orchestrated everything as part of a radical plan to force human evolution and save the species from climate catastrophe and societal collapse. Crouch excels at making complex scientific concepts accessible without dumbing them down, and his exploration of what it means to be human when enhanced beyond natural limits is genuinely thought-provoking.

The pacing is relentless, with Logan constantly on the run from government forces while uncovering layers of conspiracy.

However, the book suffers from some familiar Crouch weaknesses: characters beyond Logan feel somewhat thin, particularly his wife Ava and daughter Ava, who serve more as emotional anchors than fully realized people. The dialogue can be clunky when characters exposition-dump scientific concepts, and some plot conveniences strain credibility even within the sci-fi framework. The ethical questions around forced evolution and playing God are compelling but not explored as deeply as they could be, often taking a backseat to chase sequences and action beats. Crouch's prose is clean and propulsive, making this an easy page-turner despite its weighty themes. This book will appeal most to readers who enjoyed 'Dark Matter' and 'Recursion' but want something more grounded in near-future science rather than quantum physics. Fans of Michael Crichton's techno-thrillers will find much to like, as will readers who appreciate sci-fi that doesn't shy away from contemporary anxieties about climate change and genetic engineering. However, those seeking deep character development or literary sci-fi should look elsewhere. 'Upgrade' is solid popcorn entertainment with smart ideas, but it's more interested in thrills than profound insights.