This one has Echo team doing an extraction of US hostages in Iran and as soon as they get out he has to go back in for a second mission. But he finds backup from a new ally. Granted the group she works for is known by Mr Church, just not Joe. As they work together to stop the nukes from going off, the reader finds out more about this ally and the people she comes from. This one does have flashbacks telling of the founding of the group of the bad guys. And the new group is very secretive for good reason. A great story and leaves the reader wanting more.