Divided loyalties

If you love a great storyline, you'll love The Last Town on Earth. It's historical fiction intermeshed with medical thriller. Set during WWI, during the draft, a flu epidemic sweeps the West Coast, when one fictional town called Commonwealth, Oregon, quarantines itself from the rest of the world to prevent the epidemic to enter the town. A lot of twists and turns in each chapter to keep you guessing what happens next, all the way to the end. I recommend it.