What happens when a Navy SEAL comes home from war-with a mission.Garrett Walker is a warrior. For the last decade and a half he's been continuously at war -combat rotation after combat rotation. He's a veteran of the close fight. And he's taken a great many lives. Yet, all that combat and all those deaths were in the service of his country. Now, that's about to change.Since their college days, Garrett and his identical twin have been estranged. They...