Code of Honor by Alan Gratz

 An American Iranian teen’s life is destroyed when his brother, an Army Ranger, seems to have turned his back on America and joined a terrorist group. But as events unfold, Kamran Smith finds subtle hints in videos featuring his brother. Those hints draw on a childhood story that the brother once shared, but no one believes him.

Imprisoned by the CIA and interrogated for weeks, he is sprung and joins a rogue team of anti-terrorists who believe his story. They begin a race against time to stop a massive attack on American soil and save Kamran’s brother.

Extremely fast-past story, with tons of suspense, betrayal, and action to keep any thriller fan awake for hours.