The war that everyone had feared has finally broken out. While Sir Thomas and Mr. Bertrand cope with the grim realities of the modern battlefield in Flanders, Adelaide is sent to hunt for spies in the wilds of Yorkshire.

The safety of her adopted countrymen, and England's ability to resist the German onslaught are both at stake, and she soon learns that the fight is not limited to Europe alone, but elsewhere, and in the shadows...