I honestly think the clockwork series Cassandra Clare wrote is the gold standard for young adult fantasy, and I'll fight anyone on that. Most people know her for The Mortal Instruments, which was huge and got the movie and the TV show, but The Infernal Devices—the formal name for the clockwork prequel trilogy—is where the real magic is. There's just something about Victorian London mixed with supernatural demon hunters and clockwork contraptions that creates this incredibly moody, atmospheric vibe you don't really get in her other books.
If you've never dipped your toes into the Shadowhunter Chronicles, or if you only watched the Netflix show and felt "meh" about it, you're missing out on the best part of the whole universe. It's a rare case where the prequel is actually better than the original series. It feels more mature, the stakes feel more personal, and the writing style just fits the 1870s setting perfectly.
The Trio That Ruined My Life (In a Good Way)
At the heart of why the clockwork series Cassandra Clare created works so well is the central trio: Tessa Gray, Will Herondale, and Jem Carstairs. Now, I know what you're thinking. "Oh great, another YA love triangle." And yeah, on paper, that's exactly what it is. But in practice? It's nothing like the messy, indecisive triangles we usually see where the protagonist can't make up their mind and everyone ends up annoyed.
Tessa is a fantastic lead because she's a bookworm. She's literally moved from New York to London and finds herself caught up in this world of "Nephilim" and "Downworlders," but she processes everything through the lens of the literature she loves. Then you have Will, who is the quintessential "bad boy" but with a legitimate, heartbreaking reason for being the way he is. He's sarcastic, he quotes poetry, and he has a weirdly specific phobia of ducks.
And then there's Jem. If Will is the fire, Jem is the steady, calming hearth. He's kind, he plays the violin, and he's dying from a dependence on a demonic drug. The bond between Will and Jem—their parabatai bond—is actually more central to the story than the romance is. It's a platonic love so deep it hurts to read about, and it makes the romantic tension with Tessa even more complicated because neither boy wants to hurt the other. You end up wanting all three of them to just be happy together, which is a testament to how well Clare wrote them.
Victorian London and the Steampunk Aesthetic
Setting the story in 1878 was a stroke of genius. The London Institute feels so much more lived-in and gothic than the high-tech New York version. You've got gas lamps, horse-drawn carriages, and the constant fog of the Thames. It adds this layer of grit and elegance to the demon hunting.
The "clockwork" aspect of the title comes from the main antagonists. Instead of just fighting generic demons, the Shadowhunters are up against the "Magister" and his army of clockwork automatons. These things are creepy. They're these mechanical soldiers powered by human souls or demonic energy, and there's something inherently unsettling about the ticking sound they make before they strike.
The steampunk elements aren't just for show, either. They tie into the themes of the Industrial Revolution and the idea of humans (or in this case, a vengeful man) trying to play god with machinery. It contrasts beautifully with the ancient, almost medieval traditions of the Shadowhunters. Watching these warriors who rely on ancient runes and swords try to adapt to a world that's rapidly modernizing is fascinating.
Why the Ending Still Hits So Hard
I'm not going to spoil the specifics for anyone who hasn't finished Clockwork Princess yet, but let's just say it's one of the few finales that actually sticks the landing. Usually, with these long series, the ending feels rushed or like a "happily ever after" that doesn't quite feel earned. Cassandra Clare took a different route here.
Because Tessa is immortal (or at least, she doesn't age like humans do) and the boys are mortal Shadowhunters, the series has to deal with the passage of time. The epilogue of the final book is legendary in the book community for a reason. It's bittersweet, it's beautiful, and it spans decades. It gives you closure not just for the characters as teenagers, but for their entire lives. I don't think I've ever cried harder at a book than I did during those last fifty pages. It's a masterclass in how to handle a long-term romance in a fantasy setting.
The Themes of Mortality and Literature
One thing I really appreciate about the clockwork series Cassandra Clare wrote is how much it respects its readers' intelligence. The characters are constantly quoting Dickens, Tennyson, and Milton. It doesn't feel like "look how smart I am" filler; it's woven into who they are. They use books to understand their own suffering and their own joy.
The theme of mortality is also handled with a lot of grace. Since Jem is literally living on borrowed time, every moment the characters spend together feels heavy. It forces them to be honest with each other in a way that most teenagers aren't. They don't have the luxury of waiting ten years to say how they feel. This sense of urgency drives the plot forward even when they're just sitting around the Institute drinking tea.
It also explores the idea of what it means to be human. Tessa, who isn't quite a Shadowhunter and isn't quite a Downworlder, spends much of the series trying to figure out where she fits. Is she a monster because of her powers? Or is she human because of her capacity to love? It's a classic trope, sure, but Clare handles it with enough nuance that it feels fresh.
How It Fits Into the Bigger Picture
If you're worried about having to read thirty other books to understand this one, don't be. While it is part of the larger Shadowhunter Chronicles, the clockwork series stands perfectly well on its own. In fact, many people recommend starting with this trilogy even before City of Bones.
That being said, if you do read the rest of the books, the connections are amazing. You see the ancestors of characters you know and love. You see how certain family feuds started and where certain legendary weapons came from. You get to see the origin of the Herondale "look" and their infamous attitude. It's like a giant puzzle, and this trilogy is the corner piece that holds everything else together.
But even without the wider lore, the story of Tessa, Will, and Jem is self-contained and emotionally resonant. It's about sacrifice, the weight of secrets, and the idea that love—whether it's romantic or platonic—is the only thing that makes mortality bearable.
So, Should You Read It?
If you like historical fiction with a supernatural twist, or if you just want a story that will absolutely wreck your emotions, then yes, you should. The clockwork series Cassandra Clare gave us is a rare gem in the YA world. It's got the action and the magic, but it's the characters and their relationships that stay with you long after you put the book down.
I've re-read these books probably three or four times now, and they never get old. Every time I pick up Clockwork Angel, it feels like coming home to old friends. It's a bit dramatic, a bit gothic, and a whole lot of heart. Just make sure you have a box of tissues nearby for the final book—you're definitely going to need them.