'Imaginative, perfectly paced, and extremely clever' - Andy Weir, author of The Martian

Upgrade is the mind-bending thriller from Blake Crouch, author of the bestselling Dark Matter and Recursion.

YOU ARE THE NEXT STEP IN HUMAN EVOLUTION

Logan Ramsay is beginning to see the world around him, even those he loves the most, in whole new ways. His concentration is better, he can multitask quick, read faster, memorize more and sleep deeper.

It is not natural. His gene ...