Exactly what a YA thriller should be: smart, complex, plausible, and tense. Grant doesn't pander to his audience--the bad guys aren't wholly evil, and the good guys aren't always admirable. The near-future technology is imagined beautifully--the battlefields of BZRK are what we would get--will get--when predator drones and nanotechnology converge. Sadie's a tough-as-titanium heroine and Noah is likeable in an everyboy sort of way. Grant's writing suits the story perfectly, muscular and propulsive. Highly recommended.