Heartless is the fourth installment in the Parasol Protectorate series. This series has been an wonderful journey into a world where werewolves, vampires, and ghosts are all productive members of society and all have special department in the government of Victorian England. Parasol Protectorate also introduced and new species in the supernatural set...well it's actually the exact opposite. Supernaturals in the set of the series are created from people that have an excess amount of soul. Their opposite is called a Preternatural or Soulless. Soulless can negate supernatural effects simply by touch.
Anyway, on with the concerns of this book. Heartless brings back the mystery and intrigue that was missing from Blameless. A ghost tells of a plot to kill the queen. Who the culprit is and the motive behind it is surprising and add significant depth to the character(s) involved. While the mystery is ongoing throughout the book there are a variety of other plot threads hanging in the background and all while Lady Maccon is severely pregnant. While the pregnant Alexia provides some amusing moments it can become a glaring issue in the way the book is read. I personally was not bothered by it as it seemed realistic, but I have heard others complain that it took away from the story for them. Many other characters that before acted as obstacles or merely existed in the background come closer to center stage in this book, some in good ways, others not so much. Ivy has really shown more as a character in this book even though she was only seen briefly. Felicity also shows up considerably more for what appears to be no reason at all until it all comes together at the end of the book. I truly can't wait read the final book in the series, Timeless.
Until then, keep reading.