Mona Moon travels to Merry Old England to see Brynelleth, Robert's ancestral home, for the first time. Hoping to make a good impression, Mona finds that she is rebuffed at every turn by Robert's friends and even his servants. Despondent, Mona wants to return to the United States, but her trip is delayed when an American agent is discovered murdered on the estate. She can't leave Robert in such a lurch and begs her good friend, Lady Alice Morrell Nithercott, to help her find the culprit. Mona comes to realize she and Lady Alice have poked the wrong person and now he is out for blood - Mona's blood! She must discover who is working against her and Robert and why before it is too late.