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.

Jonathan Blake makes a living stealing antiquities--stealing them back, that is. A field agent for the Argo Foundation, a company that makes it their business to preserve humanity's history by liberating stolen artifacts from thieves and looters, Blake is used to dangerous assignments. But when he is forced by the US government into a deadly mission involving a missing Napoleonic standard, he finds himself in over his head. Blake is pitted against...