The cover art for The Prime Minister's Secret Agent is by amazing illustrator Mick Wiggins, who has created the art for all the Maggie Hope novels. Check out his fabulous website here. (In awe of his talents, as I can barely manage stick figures....)
The setting is Arisaig House, a manor house on the coast of Western Scotland, which was a SOE spy training camp during World War II. Now it's a Bed and Breakfast, and I was privledged to stay there last January, to do research. Here's a photo of the outside of the house:
The Prime Minister's Secret Agent is scheduled for release in June of 2014.