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4.5. Nearly perfect, it lagged enough in the middle that I put it down for a week, but it fully redeemed itself in the end. This is my first Blake Crouch book and I'll be reading the others. It's a surprising mix of heavy science (no idea how real or accurate it is but it was believable and not eyeroll-y), thriller, and also super emotional with some beautiful writing. It definitely made me think and feel. So good!