Strain of Defiance — Michelle Bryan

It's been eight years since the invasion. Eight years of fighting alien and human predators alike. Each day a struggle to survive. Bixby, and her crew of survivors at the Grand Hotel, thought they had lived through the worst of it. They were wrong. The invaders have evolved. They've become smarter. Stronger. Deadlier. There may be a way to eradicate this new threat. But that entails a perilous expedition over three hundred miles of infested territory. Three hundred miles of leeches, ravagers, and hybrids, all on the hunt for blood. What could possibly go wrong?