The Rising Fire - Reachers, #4

Civilization will fall. The Union are marching. They're hungry, desperate, and winter is coming. On the other side of the wall, the rich and privileged hold all the power, but that is about to change. Charlie Smith is tired of fighting, and of being hunted. After his family's murder, he seeks meaning for his life. When he hears about the Union, he realizes that this is his chance. It's time to make a stand for what's right.
As the institute closes in and civil war is about to erupt, sacrifices have to be made. But not everyone is going to make it out alive.