The Blacksmith's Daughter - The Fellowship of the Ancient Covenant, #3

The Blacksmith's Daughter is the third book in The Fellowship of the Ancient Covenant series. The Four's ancient adventures include Ian's and Jacque's service as Template Knights, Desiree becoming an apothecary, and Serena becoming a ship's captain. In modern day, the Four serve as a strike team to thwart the Select's use of nuclear weapons to create chaos. The Select are positioning themselves for world domination, an only our four heroes can stop them.