Saw this yesterday and instantly loved it. Evocative colours, very atmospheric and moody scene. It attracts and holds my attention far more effectively than any of these 'bloke-in-a-cloak' covers do. I immediately feel attracted to the book, I feel inclined to pick it up and read the blurb. Overall, I think it's a terrific cover and very effective.
The cover for Sullivan's first book, The Crown Conspiracy, is good as well. On a side note, has anyone read either of these novels and, if so, what did you think?