In The Midst Of Tribulation by Mary Griggs

Long suspicious that the world was going to go up in flames, Jay has retreated to remote Northern California and lived off the grid for years. She didn’t want to be right—but she was. When the war ended, it was clear nobody had won. Susan knows only one place where she and her extended family might be safe: with Jay, her ex. Desperate and frightened, the refugees rely heavily on their friend Piper, who agrees to make the journey with them. After a ragged reunion, Jay is willing to take in the newcomers, but the only way they will all survive on the land is if they all work and sacrifice. It is easier said than done, especially when old feelings—and new ones—break the fragile peace and threaten them all.