Jane is invited to the palace of the Prince Regent to visit his library. She is "delighted" that the Prince Regent has "granted her the honor" of dedicating her next book to him, even though she secretly despises the Prince Regent for his selfishly lavish lifestyle. While Jane is visiting the library, a military man stumbles in, foaming at the mouth and evidently poisoned. Before he dies, he manages to whisper two words to Jane, "Waterloo Map". Jane begins to investigate what the poor man could have meant, and why he would have been poisoned in the Prince Regent's own house.

I really liked this story and the history behind it. There is quite a lot of real history woven into the story with Jane's family and her acquaintances, but of course the murder mystery and Jane's involvement in the investigation are entirely fictional. I loved learning more about the military campaigns surrounding Waterloo.

I enjoyed seeing more of Jane's brother, Henry. He is always ready to dive in and assist Jane in a murder investigation. It's really interesting to imagine what their family might have been like, how they might have talked with one another, and how they would have interacted. I especially liked the scenes with Jane and her niece Fanny. Jane is supposed to be acting as a chaperone for her niece, but she's not doing a very good job because they keep getting distracted by clues.

The murder mystery is really good! I was completely fooled by the red herrings, and had no idea who the murderer could be right up until the big reveal at the end. I was totally surprised and shocked, but it all made sense.

I love the formal writing style that mimics the Regency era language. The dialogue is fairly close to what a real conversation might have been like in that time period. It really immerses you in the history.