Greyson Gray: Deadfall by B.C. Tweedt

After an unbelievable attack leaves the nation reeling, the FBI forces Greyson and his friends into seclusion, where they must deal with the heart-wrenching memories of the attack while hiding from vicious enemies bent on revenge. But Greyson can't hide for long. A new hope spurs him on as he escapes and travels across the country, stopping at nothing to find his father. When his plans unravel, he must survive as a fugitive, hunted by terrorists in an increasingly hostile and divided country, aided only by the contents of his fanny pack, a stray dog, and his ceaseless daring spirit.