Jason M. Hough 
Zero World 

Technologically enhanced assassin Peter Caswell has been dispatched on a top-secret assignment unlike anything he’s ever faced. A spaceship that vanished years ago has been found, along with the bodies of its murdered crew—save one. Peter’s mission is to find the missing crew member, who fled through what appears to be a tear in the very fabric of space, emerging into an even more confounding reality: a world that appears to be Earth’s twin.

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Jason M. Hough is the New York Times bestselling author of The Darwin Elevator. A software designer and former 3D artist and video-game designer, developing such titles as Metal Fatigue and Aliens vs. Predator: Extinction, he lives in Seattle with his wife and two sons.