Man in the Shadows — Chris Morphew

As soon as Luke touches down in Phoenix, he knows that something's not right. The brand-new town is supposed to be a paradise, but it's not long before the cracks begin to show: malfunctioning phone lines, restrictions on car use, and a private security detail instead of a police force. Then Luke, Peter and Jordan uncover the true reason for the town's existence -- a secret that means Phoenix is suddenly both the safest and most dangerous place on Earth. Someone in Phoenix is plotting to wipe out the human race. And the clock is already ticking. Previously published as two books, Arrival and Contact.