Sean O'Brien knows that his close friend, Dave Collins, isn't a man who asks for favors. After three decades as a CIA officer, Collins learned self-reliance from the best school in the world - the streets. However, after five years out of the agency, he stops looking over his shoulder. And then the assassinations begin.One by one. Five of the CIA's best former officers. Dave Collins' old colleagues. Local police can't protect retired CIA officers...