Evangeline was sent to St. Rose convent at the age of 12 by her father after her mother was kidnapped and murdered. She has led a quiet life inside the cloister, not questioning anything she has ever been told. When she receives a letter asking for access to the convent's archives from an art historian, she at once refuses, writing out the convent's usual response to such requests. But something about this one strikes her as odd; the man is looking for lost correspondence between the former abbess of St. Rose and Abigail Rockefeller in the 1940's, right before the original convent burned to the ground. In their search for the letters, Evangeline realizes that nothing in her life is as it seems and that she is a small piece of a greater puzzle. A group of angelologists, who's sole purpose is to hide the lyre of Orpheus from the Nephilim, a group of men who were born to human and angels and posses both powers. The Nephilim are intent on getting the lyre so they can release their ancestors, The Watchers, from a cave where they have been chained for centuries for disobedience. Also after the lyre is Percival Grigori, a descendant of The Watchers, the man who hired the art historian and someone with a connection to the whole mystery that is almost as deep as Sr. Evangeline's, who is slowly dying from a medical condition only the lyre can help stop.
I didn't like this too much. Some parts I loved, but the story as a whole was long, drawn out, and a bit of a DaVinci Code knock off. If I wouldn't have been house sitting and had been at home with something else to read I wouldn't have even finished it.