This book is set in the year 2028 and is about a war between angels and demons in a world that isn't really our world. It was destroyed and places that  still stand have a new name. The world was overrun by demon angels and when Heaven's angels tried to come to the rescue things only got worse especially for one angel named Sariel who fell for a demon but didn't know, and when she did she lost her wings and was bound to do her time on earth. When Lucifer heard of this she was found by his army and taken prisoner in what used to known as San Francisco.