The Blood Republic (the Infidel Books #4)

The Second Civil War ends and West Johnston is heir to the new nation-but the war in the shadows continues as they rebuild America. With team members missing, West must help save his family. But the team discovers a biological weapon, and if they fail to maintain power, it will fall into the enemy's hands.

Meanwhile, the crew finds intelligence that will change the course of the nation, and must team up with unlikely friends to escape government labs. If Gideon, Spencer, and Rene' can survive, then new hopes await-but not everyone will make it out alive.