''Horns'' is a dark fantasy novel from 2010 and the second publication from American writer Creator/JoeHill.

One morning, Ignatius "Ig" Martin Perrish awakes with a massive hangover. Something that seems more and more common for him these days. Especially since the anniversary for the night his girlfriend and the light of his life, Merrin Williams, was brutally raped and murdered and her disfigured body was found tied to a cherry tree, is rapidly approaching. To his own horror, Ig was arrested for the crime. Though the charge against him was dropped, his name was never cleared, and most of the citizens in his hometown still believes that his rich and influential family protected him against his rightfully deserved punishment. Left by most of his friends and held at a distance by his family, Ig has felt trapped in what can only be his own personal hell.

Maybe that is why, on this one particular morning, a pair of horns has sprouted from his temples.

While first assuming the horns to be a mere hallucination, simply his addled brain's way of expressing the torment and sorrow he has felt, Ig soon discovers that they are indeed real as other people acknowledge their existence. But for some reason, their reaction to the prominent growths is strangely casual. What is even more weird is that all the people Ig meets seem compelled to freely confess their most depraved, perverted and violent urges and wishes to him. He also finds out that he has the power to influence them to act upon these urges, and is capable of reading a person's innermost secrets through physical contact. Ig soon realizes these powers could help him find Merrin's killer...

A [[Film/{{Horns}} film adaptation]] made by Creator/AlexandreAja, starring Creator/DanielRadcliffe as Ig Perrish was released in 2014.

!!Tropes shown in the novel include:

* AntagonisticOffspring: [[spoiler:Lee Tourneau]] despises his mother and slowly tortures her as she dies of kidney failure.
* AntiHero: Ig never loses the core goodness in his nature, but grows more and more demonic over the course of the story and more at ease with what he can do with the horns' powers.
* ArmouredClosetGay: ThoseTwoBadGuys, Sturtz and Posada, the two police officers harassing Ig are actually both closeted homosexuals and unbeknownst to themselves deeply in love with each other. One of them confesses to Ig that he wants to blow the other while under the influence of the horns, and the other is very openly homophobic... so Ig tells the homophobe to beat on anyone that comes onto him and the other to just 'surprise' his partner. To Ig's surprise, instead of them getting into a fistfight, they're a couple when he next sees them.
* BadPowersGoodPeople: Ig grows horns, controls snakes, and literally brings out the worst in people, but he uses these to find and punish Merrin's killer, and helps a few innocent people along the way.
* BigRedDevil: Ig is turning into the classic image of Satan, starting with the horns. In time he's bald, red-skinned, sports a goatee, and even finds a pitchfork to brandish.
* BittersweetEnding: [[spoiler:Ig is reunited with Merrin's spirit in some sort of afterlife, after avenging her death and clearing his own name. In the book, Ig removes Terry's memories of being involved in covering up Merrin's death, which had nearly driven him to suicide out of guilt. Terry plans to head to New York for a more fulfilling career, and shows mutual interest with Glenna.]]
* BlueAndOrangeMorality: The chapters from [[spoiler:Lee Tourneau's]] viewpoint illustrate his psychopathy, his inability to understand those around him, and his efforts to feign humanity.
* ChildhoodBrainDamage: [[spoiler:Lee Tourneau got the back of his skull impaled by falling on a pitchfork as a child. It is heavily implied to be the reason why he is a remorseless psychopath.]]
* CompellingVoice: Sort of. Ig can make people do something they already want to do, even if it's something horrible that they've convinced themselves they don't want. However, he can't make people do something they have no interest in; Father Mould doesn't want to kill himself, and Eric doesn't want to [[spoiler:not beat up Ig]]. He can also make people forget things but, again, they have to want to forget. [[spoiler:Terry]] thinks that Ig can offer a deal, but the other person has to accept.
* ConsummateLiar: [[spoiler:Lee Tourneau]]
* DarkIsNotEvil: Ig becomes a classic demon in appearance and powers, but he's a friendly, if impish, man who comes to accept people's darker traits as a sign HumansAreSpecial, as they really aren't that bad.
* FeedItWithFire: [[spoiler:Lee beats Ig to a pulp, locks him in his car and sets it on fire. Ig manages to release the parking brake and the car rolls into the river. When he climbs from the wreckage, he realizes that instead of burning him, being engulfed in flames actually healed him, to the point where it even cured his asthma]].
* FieryCoverup: Ig's father asked a CSI he knew to do something about the evidence of Merrin's murder. The CSI didn't actually work on the case or at the facility where the evidence was stored, but he half-believes the CSI set it on fire at his request.
* FromBadToWorse: After his horns have caused his grandmother, mother, and father to confess many horrible secrets to him, Ig already believes that he has heard the worst, and when he runs into his brother, Terry, he doesn't believe that he will be able to blurt out anything worse than what he just heard, and tells him to get it over with. Terry then tearfully tells him that [[spoiler:he knows that Lee Tourneau killed Merrin]], which reduces Ig to a screaming mess for a couple of minutes.
* AGodAmI: [[spoiler:Lee Tourneau]] believes that he once, for just a brief moment, held the power of God, [[spoiler:when it actually was the result of a light case of brain damage from landing on a pitchfork with the back of his head]].
* GodIsEvil: Ig concludes that the reason why God allowed Merrin to be raped and killed is because he is actually not very fond of humans, and detests women in particular, because they, like him, can create life and also because they can redefine love as they see fit. He also compares him to a gangster, only offering his protection in exchange for blind faith and worship.
* HeldGaze: Merrin first catches Ig's attention in church by flashing light off her cross into his face so he'll look up and see her staring at him.
* IWantMyBelovedToBeHappy: [[spoiler:Ig eventually finds a letter from Merrin explaining their breakup. She's dying of the same kind of cancer that killed her sister, and decided to push him away to spare him the pain of watching her die slowly and horribly. She hopes he'd find another girl and move on before realizing the truth.]].
* JerkWithAHeartOfJerk: [[spoiler:Lee Tourneau]]
* KarmicDeath: [[spoiler:Lee dies choking on a snake, similar to how he strangled Merrin.]]
* LeaveYourQuestTest: Towards the end of the novel, Glenna finds Ig and tries to convince him to come back home with her, going back to the way things were before the start of the novel. Ig realises that as long as he [[spoiler:keeps wearing [[PowerLimiter Merrin's cross]]]], he can actually do just that... but instead, he gently tells her that not only did he hate the way things were, but ''she'' deserves much better than what he was giving her. Glenna leaves to make some changes in her life and try to be less of a perpetual LoveMartyr, and Ig goes back to preparing for his final confrontation with [[spoiler:Lee]].
* LivingLieDetector: Ig's horns compel people to confess their sins and their innermost thoughts once they see them. [[spoiler:Lee Tourneau]] is the only person immune to their effect, [[spoiler:because he has Merrin's cross. When Ig takes it, Lee can't shrug off Ig's power anymore]].
* LoveMartyr: Glenna is generous to a fault and wants nothing so much as a chance to make someone happy. Unfortunately, this has led her to have a string of boyfriends who all treated her like a doormat - Ig was arguably the best of the lot, and he barely cared about her at all. [[spoiler:The final chapter hints that her fortunes may be improving, though.]]
* MaybeEverAfter: It's strongly implied that [[spoiler:Terry and Glenna]] will end up together.
* MeaningfulName: Ignatius literally means "fiery one."
* OrificeInvasion: [[spoiler:Ig sends a snake into Lee's open mouth during the climax.]]
* OurDemonsAreDifferent: The catalyst for the plot is Ig spontaneously mutating into what appears to be a classic Christian devil with MoreThanMindControl.
* OutOfTheInferno: [[spoiler:After being locked inside a burning car, Ig finds out that not only does fire not harm him, he is actively healed by it. His clothes do, however, [[ClothingDamage react to high temperatures in the way you would expect]].]]
* PokeThePoodle: Ig frequently forbids people affected by the horns from doing the really bad things they're thinking about, but incites them into performing lesser sins instead, in many cases ones that are likely to improve their lives. For instance, he tells a store clerk that he may not kill his Alzheimer-suffering wife and go off and live with his mistress. Instead, he is to ''put his Alzheimer-suffering wife in a nursing home'' and go off and live with his mistress.
* PoliticallyIncorrectVillain: [[spoiler:Lee Tourneau]] frequently expresses racist and sexist thoughts in his narration, and internally refers to all Asians as 'slants'.
* PowerLimiter: [[spoiler:Merrin's cross]] shuts off the influence of Ig's horns.
* ProngsOfPoseidon: Ig hears a nearby commotion, and grabs the first weapon-like object in the ruined foundry without really seeing what it was. It turns out he grabbed a pitchfork.
* RedRightHand: [[spoiler:Lee Tourneau]] has a damaged, filmy eye from a childhood accident.
* SatanIsGood: Along with his GodIsEvil moment, Ig argues that the devil is the only higher being who really accepts and loves humans for what they are, despite their flaws.
* ScrewTheRulesIHaveMoney: Everybody, including Ig's parents and grandmother, believes Ig killed Merrin and that his family's money saved him from justice. His father bribed someone to destroy evidence, not realizing it actually would have proven Ig's innocence.
* SecretlyDying: [[spoiler:Merrin had late-stage breast cancer when she was murdered. The real irony was that she was rather hoping God would surprise her with a quick death, so she wouldn't have to choose between a slow death and suicide]].
* ShoutOut: To Music/TheRollingStones' "Sympathy for the Devil" and "You Can't Always Get What You Want", to the point where the final part is entitled "the Gospel According to Mick and Keith".
* TheSociopath: [[spoiler:Lee Tourneau]]. It's evident from his conversations with Ig when they were teenagers that there's something fundamentally broken in him, and the chapters told from his perspective make it abundantly clear. In his mother's one moment of lucidity, she calls him a package with nothing inside.
* TookALevelInBadass: As Ig learns to control his new powers, he becomes almost unrecognizable compared with the pathetic mess he was at the start of the book.
* TheUnfavorite: Ig is very well aware that his parents don't like him as much as Terry, and knows that his father in particular is disappointed in him because he was unable to uphold the family tradition of playing the trumpet, but he first realizes the full extent of their dislike when his horns start working on them.
* TogetherInDeath: [[spoiler:Ig and Merrin]].
* UnreliableNarrator: [[spoiler:Lee Tourneau]] constantly misunderstands the actions of others, and has a vivid hallucination of becoming god-like.
* VoiceChangeling: One of Ig's later powers is mimicking the voices of others. He can do a perfectly convincing impersonation, even of someone whose voice he's never heard before, and even over the phone to someone well outside of his horns' normal range.