The Beachhead — Christopher Mari

After Earth is decimated, the entire remaining human population is marooned on an unfamiliar beach. The enigmatic winged Orangemen leave the survivors with instructions to remake their society, basic tools and weapons, and a few thousand books, including Bibles in many languages. As two generations are born and raised, conflicting theories as to the nature of the apocalypse continue to simmer.

Fifty years later, the arrival of a new family that shouldn't exist threatens the delicate peace holding humanity together. Two young soldiers, John Giordano and Kendra McQueen, venture into the unexplored wilderness beyond the city walls in search of answers. But their disquieting discoveries only raise more questions, forcing mankind to reconsider what it means to be human.

In this reflective, provocative postapocalyptic novel, John, Kendra, and the remnants of humanity must find the strength to love and the will to forgive -- or they will all perish.