Bats of the Republic

the long version

"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 paranoia. Zeke Thomas has inherited a sealed envelope from his grandfather, an esteemed senator. When that letter goes missing, Zeke engages a fomenting rebellion that could free him--if it doesn't destroy his relationship, his family legacy, and the entire republic first. As their stories overlap and history itself begins to unravel, a war in time erupts between a lost civilization, a forgotten future, and the chaos of the wild."--from Amazon.com.