H.D. Carlton’s Cat and Mouse Duet is one of those series people don’t read quietly.

They inhale it. They argue about it. They recommend it with seventeen disclaimers and then immediately ask if you’ve got to that scene yet. It has exactly the kind of reputation dark romance thrives on: addictive, disturbing, morally messy, and impossible to discuss without somebody popping up to either declare it genius or demand to know why everyone is romanticising a walking crime spree with abs.

Honestly? Both reactions make sense.

Because the Cat and Mouse Duet is not subtle. 

It isn’t trying to be palatable. It definitely isn’t trying to be healthy. 

The story is very carefully built around obsession, fear, power, coercion, violence, and the kind of push-pull dynamic that leaves half the readership morally conflicted and the other half cackling into the void. 

If you’re like me, you did both simultaneously and wound up very confused.

It’s also one of the clearest examples of a series becoming bigger than itself. What started as Haunting Adeline and Hunting Adeline has now sprawled into a wider world of related books, spin-offs, backstory, and future plans. This duet has a life of its own, and for good reason. 

If you’ve heard of it and you’re wondering what all the fuss is about, here’s a full run down of everything you need to know about one of the most unhinged and compelling duologies I’ve ever read.

What’s The Cat And Mouse Duet About?

The Cat and Mouse Duet is the dark romance duology that made H.D. Carlton famous.

Or, more accurately, infamous. 

Zade and Adeline’s story unfolds over two novels, weaving one completely unhinged, high-octane, spicy, and unimaginably messed up story.

Adeline is a writer who inherits her great-grandmother’s gothic mansion. Zade is a stalker with a saviour complex, a talent for violence, and absolutely no boundaries. 

Part of what makes the series so compelling is dual POV that actually lends credibly weight to the MMC. I wouldn’t say equal weight, by any stretch, but we get a full arc and true depth on the male side. 

What begins as a twisted game of pursuit rapidly becomes something darker and far more complex. There’s romance twined through all of it (though deeply warped), and it’s all tangled up in family secrets, human trafficking and sacrifice, trauma, and the kind of behaviour that would be completely unforgivable in reality, but in fiction it is bizarrely compelling.

Tonally, the Cat and Mouse Duet straddles dark romance, psychological thriller, and the fuel of your most twisted desires. And nightmares. 

Haunting Adeline is all atmosphere, dread, obsession, sexual tension, and the queasy push-pull between fear and attraction. Hunting Adeline takes that foundation and brutalises it. The fantasy gives way to consequence, the violence sharpens, and the story simultaneously becomes much easier and much harder to romanticise. 

If you think that sounds confusing and conflicting, it is. I’ve read both three times and still can’t figure out how I feel about them fully. 

In isolation book 1 is polarising, confusing, and completely impossible to put down. You finish wondering that the fuck you just read, why you liked it, and questioning what’s wrong with you that you’re desperate for more. The second book recontextualises and expands on the first, to create a series that very deliberately makes readers question themselves, and the world.

Why Is This Duet So Controversial?

The books deal directly with stalking, coercion, rape, torture, trafficking, captivity, and extreme psychological manipulation, while still asking the reader to stay emotionally invested in the central relationship. 

For some readers, that makes the series a boundary-pushing dark fantasy. 

For others, it crosses every conceivable line. 

Either way, these are not books people have neutral feelings about.

The writing itself isn’t elegant but it is compulsively readable. H.D. Carlton is not subtle, restrained, or especially interested in tasteful storytelling. What she is very good at is tension. 

The duet is packed with cliffhangers, escalating danger, lurid intensity, and just enough mystery running beneath the romance to keep the pages turning even when you’re side-eyeing half of what’s happening. 

If you like your dark romance genuinely dark, chaotic, addictive, and just a little morally catastrophic, there’s a good chance this will work for you. 

If you want clean ethics, healthy dynamics, or a comfortable reading experience? Absolutely not. This isn’t for you. 

And because it really does need saying plainly: this is a rough read. Even if you’re comfortable with dark romance, check the trigger warnings before you start this. We’re not talking Ana Huang or Navessa Allen level of ‘dark’, here. I won’t say it’s the darkest thing I’ve ever read, but it’s well up there. Trigger warnings for the duet include stalking, sexual assault, rape, coercive control, torture, trafficking, captivity, graphic violence, child trafficking, ritualistic violence, and significant psychological trauma. 

This is not an aesthetically dark romance duology. 

It’s deeply disturbing, morally questionable on every level, and potentially genuinely traumatic. 

Handle with care. 

The Cat and Mouse Duet Books

If you’re trying to work out what the actual Cat and Mouse Duet books are, here they are.

Book 1: Haunting Adeline

This is where the obsession starts. Gothic house, inherited secrets, stalker hero, all the warning signs in the world, and absolutely no intention of behaving sensibly around any of them. It’s the book that made the series famous, the book that built the discourse, and the book that tends to drag readers into dark romance whether they meant to end up here or not.

If you want my full thoughts, you can read my review of Haunting Adeline here.

Book 2: Hunting Adeline

This picks up immediately after Haunting Adeline and there is really no graceful way to say this: it goes harder. The tone shifts, the fantasy gets stripped back, and the emotional and physical consequences hit with much more force. It’s nastier, heavier, and far more brutal, but it’s also the book that completes the arc and, in my opinion, is the reason the duet works as well as it does.

You can read my full Hunting Adeline review here.

Cat and Mouse Duet Reading Order

These two books are the core of the ‘Haunting Adeline series’. Technically, the Adelines (the Cat and Mouse Duet specifically) are a complete series. But it’s a bit messier than that, and you may see several of H.D. Carlton’s other books are described as being part of the same series. 

The Cat and Mouse Duet in order is super simple:

• Haunting Adeline
• Hunting Adeline

Unfortunately because there’s only one letter difference between the titles of book 1 and book 2, it’s easy to get confused about which goes first. But I promise, this is the right order to read them in.

Where things get a bit murkier is that the duet now sits inside a wider connected world. Those books are not part of the duet itself, but they are tied to its characters, themes, or history. So if what you actually want is the best reading order for the duet and the related spinoff books (which I’ll explain properly in a sec), the best order is:

• Haunting Adeline
• Hunting Adeline
• Satan’s Affair
• Where’s Molly
• Phantom

You will absolutely see people put Satan’s Affair first. Because, technically it happens earlier and publisher copy has recommended that order in the wider Cat and Mouse universe.

That’s not nonsense, but it is also not how most readers actually experience these books. Nor the best way to read them.

Most people start with Haunting Adeline, because that is the book that made the Cat and Mouse Duet famous. And in practice, I think that works better for a lot of readers anyway. Satan’s Affair is all about Sibby, who is much more interesting once you’ve already met her in the main story. Otherwise, well to be honest I’m unsure how Satan’s Affair would land if you didn’t already know who she is, and why she matters. I see a lot of people slating it as weird, chaotic nonsense, and suspect it’s because they don’t have character context.

And you really need context for Sibby she’s…a lot.

Where’s Molly really shouldn’t be read before the duet because it picks up one of the darkest threads left hanging in its wake. That’s the book that answers a big, unanswered question the Cat and Mouse core duology creates. So, definitely read it after.

Phantom is the outlier. Chronologically, it comes years before the duet. Reading it first, however, will absolutely ruin the core mystery of Haunting Adeline, so…nope. Defo don’t start there!

The Spinoff Books In The Cat And Mouse World

The spinoff books are the reason so much confusion exists around this ‘series’. Because they follow characters mentioned in the Cat and Mouse Duet, and expand the duology’s world in general, people start treating them as if they’re part of the duet itself.

Like it’s all one big series.

It’s not.

The duet is Haunting Adeline and Hunting Adeline. 

So while the other books are related, they’re not actually part of the series. They’re spin-offs, expansions, backstory. Same world, same orbit, not the same central arc.

Satan’s Affair is Sibby’s book. More specifically, it’s the book that exists because Sibby turned out to be one of the most memorable side characters in the whole thing. If she fascinated you, disturbed you, or made you want to know what the hell happened to her, this is where that curiosity goes.

Where’s Molly is the most natural “what next?” read after Hunting Adeline, because it follows a thread the duet very deliberately leaves open ended. The titular question will gnaw at you once you get to the end of the duology. This book answers the question.

Phantom is historical backstory. It goes back into the Parsons history that shadows Haunting Adeline, which makes it interesting if that element of the books hooked you, but it is not the next instalment of the main story and shouldn’t be treated like one. It’s also very different in tone, style, and reading experience. I was actually fundamentally disappointed with it as a novel, it wasn’t for me. 

Is There a Cat and Mouse Duet Book 3?

No.

There is no book 3 of the Cat and Mouse Duet, and never will be. H.D. Carlton has been very specific about this – she may write a future book revolving around Adeline and Zade, but it will not be ‘Cat and Mouse book 3’. It can’t be.

A duet is two books.

You can’t have a book 3 in a duology.

Sorry!

When people talk about a third book, they usually mean one of three things. They either mean Satan’s Affair, because it’s connected to the same world, or Where’s Molly, because it follows on from one of the duet’s darkest threads. 

And, of course, there are those who just crave a third book in the series because they’ve finished Hunting Adeline and genuinely don’t know what to read next.

Like, how do you follow that?

These are all perfectly understandable responses to finishing the duology.

None of them mean a third duet book exists.

Will There Be More Cat and Mouse Books?

No. Really. The Cat and Mouse Duet is just the two books. There are, however, more books set in the same world planned. H.D. Carlton has said she is penning another duet series about for Sibby. 

So there will be more in this world, but there will never be more in this series.

Originally, she had hoped to release the first of Sibby’s books in 2023. That plan has since been shelved while she gives the books more thought. So, we’ve no confirmed release date and no solid timeline for when that Sibby duet will actually appear. If you’re eagle eyed and stalk her website, you’ll also notice it’s not included on her progress carousel on the homepage yet, either. So, whatever she’s doing with Sibby, she’s not ready to make it official yet.

Which is both understandable and mildly maddening.

Sibby is exactly the kind of character who could go spectacularly wrong if the books aren’t handled properly. Mildly maddening, because I had so many questions about her by the end of Hunting Adeline, and Satan’s Affair just doesn’t cover any of it, because it’s set prior to the Cat and Mouse Duet, while I need to know what happens to Sibby after.

So Why Is The Cat and Mouse Duet Actually So Good?

I think the reason the Cat and Mouse Duet works as well as it does is not because Zade is hot, or because the spice is outrageous, or even because the books are controversial enough to keep BookTok frothing at the mouth.

It works because H.D. Carlton understands that the real hook in dark romance is not darkness.

It’s permission.

Not permission to want the things these characters do in real life, obviously. Permission to step into a fantasy that is ugly, extreme, unsafe, and morally indefensible, and to explore it without pretending it’s actually okay. Most dark romance still wants to hand you a safety rail. It wants the man to be just redeemable enough, the fantasy just sanitised enough, the moral line just visible enough that you can enjoy yourself without feeling too implicated.

The Cat and Mouse Duet does not do that.

That is exactly why people can’t shut up about it.

These books don’t just ask whether you fancy a dangerous man. They ask what happens when desire itself becomes compromising. When fear is part of the pull. When obsession is intoxicating. When being wanted to the point of annihilation becomes its own fantasy. 

And that’s what a lot of the discourse misses. 

The power of this duet isn’t that it gives readers a dark hero to swoon over. It’s that it forces them into direct confrontation with the part of themselves that finds this kind of extremity compelling in fiction. Even while knowing it would be monstrous in reality.

That’s a much more uncomfortable reading experience than people like to admit.

The weird part about this series is that Hunting Adeline is the secret weapon. Because without it, Haunting Adeline is just a very effective chaos grenade. 

It’s gripping, yes, but also slippery in a way that makes the moral framework feel almost too unstable to hold. Hunting is what turns the whole thing from “what the hell even is this?” into something nastier, smarter, and far more psychologically interesting. 

It doesn’t clean the first book up. It doesn’t absolve it. 

What it does is make the reader sit in the difference between fantasy and violation in a much harsher, less escapist way. And that’s where the duet stops being merely shocking and becomes genuinely effective.

The Cat and Mouse Duet isn’t good because it’s romantic, or beautifully written, or even particularly well plotted. 

It’s good because it’s manipulative.

And that really shouldn’t be surprising, given every one of Adeline’s chapters in book 1 are titled ‘The Manipulator’.

She is, after all, a writer.