If there's only one thing I can say about Diana Urban's writing is that she knows how to write twisty thrillers that keep you constantly on the edge of your seat. Then she throws in just the right amount of romance to add perfect chemistry between her characters. This book sounds even more exciting than her last and I can't wait to get my hands on it! Lost in Parisian catacombs being chased by a creepy unknown being with no known way to escape? Sign me up for this thrill ride of a read. This one has already been added to my TBR!