The final installment of the Immortal Empire series is a fitting finish. It gives us enough twists and turns, mystery, romance, and humor to really enjoy the overall story told starting all the way back in God Save the Queen. The surprises are fast and furious, the reveals are neatly handled, and the relationships truly grow into their own as each layer is peeled back.
Locke adds in a few new elements---namely a Frankenstein element that fits quite neatly into the subtle laboratory work mentioned and hinted at in the earlier installments. The fact that the tissues harvested from Xandy in the second book have generated into a monster is a neat twist and gives us another layer of examination at just who and what is a monster. We're forced to encounter that question in Ali's existence exquisitely. On one hand, it's clear that this killing machine is doomed and must be put down---on the other, she's as much a victim as the rest when the true monster behind it all is revealed.
Locke keeps us guessing through out. At some points, we suspect that Victoria may be the one behind everything. As the suspect bingo card is crossed off, it becomes quite clear that the perpetrator has to be quite close to the throne. And yet, Victoria is also the red-herring that we must rule out. Why would she go out of her way to create such trouble, wreak such havoc, or imperil her position this way? What would Victoria gain from these labs and this scheme? It'd set up another Great Insurrection, and that would only end badly for the Immortal Queen of England. So, Locke gives us clues, teases us along, and surprises us as we dig deeper into that mystery that has been present since the first chapter of the first book.
There can only be one real culprit. If it isn't Churchill---already long dead---or Ainsley, the vampire that stole Dede's child---or Victoria, then who? There's one person who would gain and has been waiting so very long to become King. Bertie, Prince of Wales. Unlike the man who would become Edward VII in our timeline, this Bertie has had over a century of waiting, partying, and plotting. He's the one that has done the worst---namely the one that murdered Albert, his own father. The way Locke presents this reveal is shocking and reveals just how depraved the Prince has become at this stage. We witness him, quite literally naked and exposed, in bed with Xandy's mother----only to betray her and hand her over to the authorities for a murder he committed. He used the same method to kill Xandy's father, Vardan, as he did his own. Bertie has been cooking up quite a monstrous scheme---and we see it reach its near culmination with his meddling with the nature of the plague, making it shift into a highly virulent form either to kill or change humankind. He wants to be a dictator. And in this way, as he manipulates Ali, we see him as the true monster while she's merely the physical extension of his utter depravity.
The sheer death and gruesome detail of Vardan's murder---and Albert's in the long past---captures that depravity even further. It is dark and messy and graphic in nature. We need to witness it with Xandy so we can truly understand the evil that is at the root of the scheme Bertie has unleashed upon this world. And the actions he takes after with sending the finger not to Xandy but to his own mother seals that cruelty he'd hidden so well for years.
The story of Xandy continues to also evolve beautifully. In the first and second book, she struggles so much with accepting her true nature. She's afraid of what it might mean, what she might do, who she might become. She's uncertain about feeding as a goblin, afraid that she'll become the monster all the humans think they are. She finds herself going back and forth from acceptance to denial. In this final installment, that is no longer the case. Instead, Xandy has totally embraced herself. Faced with the strange look alike in Ali, she can now see the mirror reflection of her deepest fears brought to life and reject them as simply fears. She's not like this Ali. She's not willing to rip people apart in seeming pleasure. She's not cruel or vicious. She can be ruthless when necessary, but Xandy can now see that she's more than the monster she feared becoming. Instead, Xandy can truly see that she's stronger for who she is---and while she's realizing that perhaps she's not as strong as she thinks she is, she can take heart that she's better for that vulnerability. This transformation truly reaches its culmination when we see her in the Den before the big showdown. Her acceptance of the heart, the first Goblin Queen's blood, and the blood from the entire plague captures that true sense of self expertly. She truly becomes who she's always meant to be in that moment---odd transformations and urges and all. It's a dark and gruesome moment from a human standpoint---and yet perfect for her kind and the situation.
Locke handles her characterization of Victoria extremely well. She's the imperious, long lived, smart, and secluded monarch we'd recognize in our own world---the one that held Europe together in the period before WWI---and yet we see some glimpses of who she may have been mixed in with the qualities she certainly didn't hold (ie, being a vampire). She swears. She's a fighter with training. She's vulnerable. She's a mother faced with a difficult choice. She's lonely and in need of someone like Xandy and Xandy's sister, Avery, to broaden her widowhood world. Victoria, seen in glimpses in the first two books, truly becomes a real woman and character in this story. She's a mentor to Xandy all the while being an adversary. She fights with Xandy almost like a sister. All in all, Victoria almost deserves her own book series----from the time she takes the throne to shaping this world.
Vex and Wiliam also get to shine. Secrets about Wiliam come to light as well---some shocking and so fitting considering the nature of his relationship with Victoria. The humanity of the goblins continues to shine as they rally around their queen and other hurt members throughout. William is steadfast at Xandy's side. He's the father she wanted but didn't have growing up and is the rock her queenship will be built upon. He's gentle under his gruffness and smart and strong. He mentors her in a way no other seems to do---including Vex. Vex, on the other hand, is heart-stoppingly sexy and comes much into his own in this book. He is not willing to remain simply patient with some of Xandy's tendencies to go wild---especially after both of them have suffered so much at Ali's vicious hands. It's just the push Xandy needs to finally do what she should have done two books ago: agree to marry the Alpha as we knew she would.
Xandy also grows in relationship with her sister, Ophelia, and we see them truly become the siblings they fight being the rest of the series. After all, it is Fee that calls Xandy in the moment she realizes their mother is betraying the cause with the Prince of Wales. We see them bond over Rye, as one is willing to let the other court the former love.
In that way, this book series ends brutally with the death of two children---one laboratory made, the other made by greed---but ultimately shines as a story about love and family. Victoria, Xandy, Vex, William, Fee, and the rest all do what they do to stop the nefarious plot to save their country and their family. After all, family doesn't really end with blood in this series---it's where it begins.