History Series / LetTheRightOneIn

* PuppyLove: Eleanor and Isaiah are both twelve (though for her, only [[NotAllowedToGrowUp in appearance]]). After becoming friends, Isaiah falls for Eleanor, [[LoveConfession telling her how he loves her]]. This may well be the first girl he's ever liked that way.

* AdorablyPrecociousChild: Eleanor seems this way to people unaware of her true age, acting and speaking older than the girl of twelve she apparently is. That's because she's a vampire who's chronologically twenty-two.
* AffectionateNickname: Mark usually calls Eleanor Ellie (she's his daughter whom he's devoted to).

The series centers on Mark and his daughter Eleanor, whose lives were changed 10 years earlier when she was turned into a vampire. Locked in at age 12, perhaps forever, Eleanor lives a closed-in life, able to go out only at night, while her father does his best to provide her with the human blood she needs to stay alive.

* DoesThisRemindYouOfAnything: [[spoiler:It turns out that Eleanor Kane and Peter Logan were infected by the same vampire and around the same time, ten years ago. Said vampire was an adult man posing as a staff member while both kids were taking part in a stargazing field trip, and tricked them into writing down their names and addresses on his clipboard. Later, he used that to track them down and bite them. The fact he was deliberating targeting fresh-faced young people for recruitment and obliquely compares himself to comet finder Charles Messier spending "lonely hours" looking for "fleeting little jewels" makes him come off as a pedophilic/ephebophilic stalker. He tried to abduct at least Eleanor (we don't witness the attack on Peter) after biting her, too, and was narrowly prevented by her parents]].

** Isaiah and his mother Naomi also don't know what became of his dad at first. They don't learn he's dead (killed by Mark in the pilot) until the fifth episode.

** Isaiah and his mother Naomi also don't know what became of his dad at first. They don't learn he's dead (killed in the pilot) until the fifth episode.

* DoesThisRemindYouOfAnything: [[spoiler:It turns out that Eleanor Kane and Peter Logan were infected by the same vampire and around the same time, ten years ago. Said vampire was an adult man posing as a staff member while both kids were taking part in a stargazing field trip, and tricked them into writing down their names and addresses on his clipboard. Later, he used that to track them down and bite them. The fact he was deliberating targeting fresh-faced young people for recruitment makes him come off as a pedophilic/ephebophilic stalker. He tried to abduct at least Eleanor (we don't witness the attack on Peter) after biting her, too, and was narrowly prevented by her parents]].

* DoesThisRemindYouOfAnything: [[spoiler:It turns out that Eleanor Kane and Peter Logan were infected by the same vampire and around the same time, ten years ago. Said vampire was an adult man posing as a staff member while both kids were taking part in a stargazing field trip, and tricked them into writing down their addresses on his clipboard. Later, he used that to track them down and bite them. The fact he was deliberating targeting fresh-faced young people for recruitment makes him come off as a pedophilic/ephebophilic stalker. He tried to abduct at least Eleanor (we don't witness the attack on Peter) after biting her, too, and was narrowly prevented by her parents]].

* AdorablyPrecociousChild: Eleanor seems this way to people unaware of her true age, acting and speaking older than the girl of twelve she apparently is. That's because she's a vampire who's chronologically twenty two.

* FakingTheDead: Arthur claimed that Peter, his son, was fatally wounded by a bear. He'd actually been bitten by a vampire, becoming one too. Arthur faked his death and kept him a secret since, trying to find a cure, only telling his daughter Claire as a result of Arthur's having cancer, enlisting her to carry on his work.
* FromCamouflageToCriminal: A drug dealer's enforcer who hunts down Mark served in the US Army Special Operations.

* GenreSavvy: Zeke was very helpful when Eleanor first became a vampire, as he'd seen a lot of vampire movies and had some idea what was going on. He didn't hesitate after first seeing Eleanor leaning hungrily near her mom with bared fangs, but got her blood (that her dad donated) and gave them other pointers after that.

* NotGrowingUpSucks: Eleanor is a vampire girl who's stuck permanently as twelve, physically anyway. She isn't happy at this, still having to blend in by appearing like a tween even though mentally she's more mature. Peter, being stuck at the more ideal age of 18, is less upset about that part, and is unhappy when his sister Claire figures out how to remove his immortality but not any of the other aspects of being a vampire yet.

** Claire and her henchman Matthew also serve as this for her brother Peter, who has become a vampire, providing him with blood but also killing people who are or could be threats.

* TheVirus: In the series vampirism is explictly the result of a virus that any person who's bitten will become infected by (assuming they survive).

* YouHaveGotToBeKiddingMe: When the first symptom of vampirism that Claire figures out how to cure is the lack of aging, Peter complains that she wants to remove the only good thing about being a vampire. He has a point, since now he'll still be vulnerable to sunlight and need blood to survive, but also die of natural causes one day on top of that.

* DisappearedDad: Isaiah's dad is a deadbeat alcoholic who's in and out of his life, to his mom's anger. She goes along with their having contact though for his sake. [[spoiler:He's murdered soon after being introduced.]]

* JackBauerInterrogationTechnique: Mark, after being knocked out by Matthew and held prisoner, then gets tortured for information. Matthew, who served in the US armed forces, is implied to have done this before. He claims that torture is effective with the right execution, and gleans information from Mark not just by his answers but non-verbal reactions to his questions. The only torture he has to engage in with Mark is [[{{Fingore}} removing a fingernail]]. A compatriot of his continues to torture Mark after he leaves however, as punishment for (he thinks) harming another member in their crew, who removes all his other fingernails then starts on ElectricTorture when Eleanor's arrival interrupts things.

* NotGrowingUpSucks: Eleanor is a vampire girl who's stuck permanently as twelve, physically anyway. She isn't happy at this, still having to blend in by appearing like a tween even though mentally she's more mature.

* VampireInvitation: Vampires need to be invited in. Eleanor covers this by claiming that her dad says it's impolite to go into someone's home without asking first.

* WeakenedByTheLight: As usual, vampires here are harmed by sunlight. It's shown in the very first scene as a young male vampire, Peter, starts to burn when the light hits him, and with Eleanor later as well. Peter gets left with hideous burns.

** Isaiah slowly realizes that Eleanor isn't an ordinary, as a result of her glowing eyes and never eating. She confesses that her eyes glow from seeing in the dark, and she's incapable of eating anything but blood. Though the word "vampire" isn't used, clearly Isaiah knows what this means from the look on his face. All this is after the audience had seen from the beginning that she's a vampire.

* AssholeVictim: When donating using their own blood was too taxing, instead Mark decided to target sex offenders in the area to drain theirs. However, this didn't work out in residential areas, as he almost gets caught when leaving hastily after murdering one, which makes him back into a car.

* ContrivedCoincidence: Mark just happens to have an apartment beside the ex-wife of the man he just killed, who's a police detective investigating murders he's linked with as well.

* TheRenfield: Mark, vampire Eleanor's dad, provides for her by letting her feed on his blood, plus other people's whom he's killed. He moves them around repeatedly seeking other vampires hoping to find a cure too, and for her safety so they aren't discovered.

* AscendedExtra: Håkan is the novel's tritagonist. In contrast, Mark is the series' protagonist and Demián Bichir is the top-billed actor.

* StandardFemaleGrabArea: {{Discussed}} by Naomi, who shows Eleanor that most attackers will grab her by the wrist. This is {{subverted}} as a weakness since she then teaches Eleanor how the female subject of this can then counter it very effectively, rather than be vulnerable to the attacker. Eleanor of course already is quite able to handle herself, despite having a twelve year old's body physically, given she's a vampire with {[super strength}} and [[SuperSpeed speed]].

* GenreSavvy: Zeke was very helpful when Eleanor first became a vampire, as he's seen a lot of vampire movies and had some idea what was going on. He didn't hesitate after first seeing Eleanor leaning hungrily near her mom with bared fangs, but got her blood (that her dad donated) and gave them other pointers after that.

* NotSoDifferentRemark: Mark hallucinates the priest he spoke to says he's not that different from the men who'd captured and tortured him, noting how he'd murdered Isaiah's father after he begged for release so Eleanor could feed on his blood. As it's Mark's hallucination, he's thinking this about his crime due to guilt.

* BoomHeadshot: In "Broken Glass" Naomi shoots the killer she's been tracking (really a vampire, though she isn't aware of that) in the chest multiple times (as she's trained to) before finally shooting him in the head after the rest don't even slow him. This kills him, and leaves her spooked.

* ParentalMarriageVeto: Eleanor is in mutual love with Isaiah, wanting to be with him as he accepts her being a vampire while very few would. Mark, her father, gently says that it can't be, since his mother is a cop who could expose their crimes. Eleanor is left heartbroken as a result.