"In 1843, fragile naturalist Zadock Thomas must leave his beloved in Chicago to deliver a secret letter to an infamous general on the front lines of the war over Texas. The fate of the volatile republic, along with Zadock's future, depends on his mission. When a cloud of bats leads him off the trail, he happens upon something impossible...Three hundred years later, the world has collapsed and the remnants of humanity cling to a strange society of...