From the Vatican to the Swiss Alps, from Australia to the heartland of America, the two masterful operatives known as Saul and Drew are being drawn together to solve a violent riddle: Why have ten old men been abducted from around the world? When the agents, weary of their own covert wars, begin to investigate, they are pulled into a terrifying cycle of revenge that began in the heart of World War II and is now forcing sons to pay for their fathers' darkest sins.