Great book that blends steampunk and paranormal perfectly. This book is very inventive and a breath of fresh air in a crowded field. In Victorian England werewolves, vampires, and ghosts are all a functioning part of society and Alexia Tarabotti is the only antidote, the lone preternatural in all of London. Simply put, she has no soul, which is the exact opposite of the supernatural creatures which have an excess of soul. The world building and mythology of this book is fascinating and carefully laid out, and incredibly detailed. I loved the premise and the story/mystery itself was very engaging.