Book excerpt: The world has ended, but her journey has just begun. Thirty-year-old Zoe leads an ordinary life until the end of the world arrives. She is cleaning cages and floors at Pope Pharmaceuticals when the president of the United States announces that human beings are no longer a viable species. When Zoe realizes that everyone she loves is disappearing, she starts running. Scared and alone in a shockingly changed world, she embarks on a remarkable journey of survival and redemption. Along the way, Zoe comes to see that humans are defined not by their genetic code, but rather by their actions and choices. White Horse offers hope for a broken world, where love can lead to the most unexpected places.