Science fiction, fantasy, and horror books can be filled with foes of all kinds—from aliens and orcs to ghosts and slashers. But there’s something uniquely and horribly unsettling about having to battle a version (or multiple versions!) of yourself—be they a double, doppelgänger, or clone.
Facing off against a double is a fairly common problem in the world of superheroes, with everyone from Superman to Captain America having gone toe-to-toe with themselves. Such mirror matches usually play out the same way: the characters are a physical match, but something about the hero’s idiosyncratic identity—be it their tenacity, heart, or past experiences—gives them the extra boost needed to defeat their alternative (often evil!) self.
Outside the world of comic books, however, dealing with doubles can get a little more complicated. Not only do doppelgängers and clones often bring a character’s inner demons to the surface, but defeating them can also be a little trickier—as the five books below demonstrate.
The Dark Half by Stephen King (1989)
Thad Beaumont has made a successful career out of being a novelist—but not under his own name. All of his best-selling books—which are ultra-violent crime novels—have been written under the pen name George Stark. The story starts with Thad deciding to retire the pseudonym, which he does by staging a fake funeral for his alter ego. But Stark doesn’t want to be killed off and literally claws his way out of the grave to enact bloody revenge on anyone who had a part in his death.
The Dark Half is clearly a personal book for Stephen King, who wrote a few novels under the pen name Richard Bachman. So it makes sense that there’s a good deal of introspection about personal and authorial identity in the story, but it’s also full of gruesome kills thanks to Stark’s murder spree (which lands Thad in hot water because while they aren’t 100% superficially identical, the two do share fingerprints and DNA).
The Dark Half might not be one of King’s best books—it’s admittedly hard to top masterpieces like The Stand (1978) and IT (1986)—but it is one of his most underrated.
Dark Matter by Blake Crouch (2016)
Dark Matter is a sci-fi thriller that works brilliantly when you go in knowing absolutely nothing. Since it’s on this list, I’ve already revealed that there’s some sort of double or doppelgänger shenanigans going on, but what form that takes can still be a surprise (and won’t be revealed in the description below!).
The book starts with physics professor Jason Dessen being knocked out while walking home one night and then waking up to a changed world. His wife claims they never married, his teenage son doesn’t exist, and he’s apparently been working on an experimental physics project. All Jason wants is to get his family back, but achieving that might not be so easy.
The journey that Jason goes on in Dark Matter is hectic, twisty, and mind-bending. That isn’t exactly ideal for our main character, but for the reader it results in a fast-paced plot that barrels breathlessly forward.
The Murders of Molly Southbourne by Tade Thompson (2017)
In some sci-fi stories, clones get on fairly well with each other, but The Murders of Molly Southbourne is not one of them.
Molly Southbourne has a bizarre condition: every time she bleeds a clone of her is created, and that clone will eventually try to murder her. The novella starts with one of these clones—which Molly refers to as “mollies”—waking up chained to a wall in a basement. She’s confused and can’t remember how she got there, and then Molly comes in and tells her the story of her life.
Tade Thompson manages to pack a lot into this compact novella. The tale that Molly tells is strange, engrossing, and, as would be expected from the premise, very bloody.
Such Lovely Skin by Tatiana Schlote-Bonne (2024)
Teenager Viv has had the summer from hell, but her life is about to get even worse. She accidentally killed her little sister and then lied about it and she’s been wallowing in a pit of grief and guilt ever since. With school about start up again, she decides to try to get back to some sense of normality by doing her first Twitch stream—which is how she makes money—in months.
While doing an offline run-through of an indie horror game, Viv reveals the truth of her sister’s death to an NPC (non-playable character). But telling this secret allows an evil mimic to latch onto her. The demonic doppelgänger starts causing mayhem, but Viv is only able to convince one person that she isn’t the culprit: Ash, an outcast boy who she’s previously spread nasty rumors about (unbeknownst to him).
I found Viv’s self-obsessed personality to be a little bit grating, but the visceral horror imagery throughout the book more than makes up for that.
The Other by Annie Neugebauer (2026)
I’m a sucker for any story that takes place in the woods (and I just recently put together a list of horror stories set in jungles and rainforests!) and The Other makes great use of its nature setting.
Elise and Logan are at a crossroads in their marriage, so they’ve gone on a multi-day hike in the woods to give them space to think and talk through their relationship. It’s initially a quiet retreat, but then they come across another couple on the trail who look eerily like them. Although a little unsettled by the coincidence, they’ve already set up camp and it’s rapidly getting dark so they decide to stick it out. But then they wake up the next morning to find that the other couple are now not only identical to them, but they’re also claiming to be them.
The Other is the kind of fast-paced novella that can be read in just a couple of sittings. It’s an incredibly stressful premise—Elise and Logan aren’t even sure of each other anymore, but they know that they can’t let their doppelgängers get back to the car at the trailhead—and it’s made all the more tense by the isolated setting.
There are surely plenty of other books out there that feature someone having to battle an alternate version of themselves. Be it a classic or something more modern, feel free to leave your suggestions and recommendations in the comments below!
