Once again, Thomas Taylor gives us a look over the shoulder of world-class protectors. Two years after the events in Mortal Shield, Lieutenant David Armstrong and his team from the Governor's Security Division return to find themselves and their protectee — Missouri Governor William Ulysses Stovall — in harm's way. Stovall has teamed up with a firebrand Islamic cleric, Imam Adel al-Walid, to take on Islamic extremists. When they announce a high profile town hall meeting with national impact at the historic Gateway Arch in St. Louis, a group of violent homegrown terrorists decide it's the ideal target. What follows is a race inside the upper reaches of the Arch with terrorists closing in on Stovall and his protectors from all sides. Armstrong and his team will once again be tested to the limits of their abilities, their dedication, and their willingness to put their lives on the line to protect the First Family. Not everyone will make it out alive.