When twenty-three-year-old Sister Evangeline accidentally stumbles upon some mysterious letters exchanged between the late mother superior of her convent and the famous philanthropist Abigail Rockefeller, she is thrust into an ancient conflict between the Society of Angelologists and the monstrously beautiful descendants of angels and humans, the Nephilim.

Thirty years after global holocaust, the colony of Carthage still struggles to build its new world. While steam engines and other early industrial technology have empowered its economy, the fragile society is undermined by secret crimes, rifts between generations, government censorship, and a legacy of casting out those who suffer from radiation sickness.
Embittered survivor Hadrian Boone—once a revered colony founder—has been hounded...