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Plot

The novel is prefaced by a fictitious foreword by one John Ray Jr., an editor of psychology books. Ray states that he is presenting a memoir written by a man using the pseudonym "Humbert Humbert", who had recently died of heart disease while in jail awaiting trial for an unspecified crime. The memoir, which addresses the audience as his jury, begins with Humbert's birth in Paris in 1910 to an English mother and Swiss father. He spends his childhood on the French Riviera, where he falls in love with his friend Annabel Leigh. This youthful and physically unfulfilled love is interrupted by Annabel's premature death from typhus, which causes Humbert to become sexually obsessed with a specific type of girl, aged 9 to 14, whom he refers to as "nymphets".

After graduation, Humbert works as a teacher of French literature and begins editing an academic literary textbook, making passing references to repeated stays in mental institutions at this time. He is briefly married to a woman named Valeria before she leaves him for another man. Before the outbreak of World War II, Humbert emigrates to America. In 1947, he moves to Ramsdale, a small town in New England, where he can calmly continue working on his book. The house that he intends to live in is destroyed in a fire. In his search for a new home, he meets the widow Charlotte Haze, who is looking for a lodger. Humbert visits Charlotte's residence out of politeness and initially intends to decline her offer. However, Charlotte leads Humbert to her garden, where her 12-year-old daughter Dolores (also variably known as Dolly, Lo, and Lola) is sunbathing. Humbert sees in Dolores, whom he calls Lolita, the perfect nymphet and the embodiment of his first love Annabel, and quickly decides to move in.

The impassioned Humbert constantly searches for discreet forms of fulfilling his sexual urges, usually via the smallest physical contact with Dolores. When she is sent to summer camp, Humbert receives a letter from Charlotte, who confesses her love for him and gives him an ultimatum —he is to either marry her or move out immediately. Initially terrified, Humbert then begins to see the charm in the situation of being Dolores' stepfather, and so marries Charlotte. After the wedding, Humbert experiments with drugging Charlotte with sleeping pills with the intention of later sedating both her and Dolores so that he can sexually assault Dolores. But while Dolores is at summer camp, Charlotte discovers Humbert's diary, in which she learns of his desire for her daughter and the disgust he feels towards Charlotte. Shocked and humiliated, Charlotte announces her plan to leave, taking Dolores with her, having already written a number of letters to her friends warning them of Humbert. Disbelieving his false assurance that the diary is only a sketch for a future novel, Charlotte runs out of the house to send the letters but is hit and killed by a swerving car.

Humbert destroys the letters and retrieves Dolores from camp, claiming that her mother has fallen seriously ill and has been hospitalized. He then takes her to a high-end hotel that Charlotte had earlier recommended, where he tricks her into taking a sedative by saying it is a vitamin. As he waits for the pill to take effect, he wanders through the hotel and meets a mysterious man who seems to be aware of Humbert's plan for Dolores. Humbert excuses himself from the conversation and returns to the hotel room. There, he discovers that he has been fobbed off with a milder drug, as Dolores is merely drowsy and wakes up frequently, drifting in and out of sleep. He dares not initiate sexual contact with her that night.

In the morning, Dolores reveals to Humbert that she engaged in sexual activity with an older boy while at camp that summer. Humbert then advances on Dolores, having sex with her. After leaving the hotel, Humbert reveals to Dolores that her mother is dead. In the coming days, the two travel across the country, driving all day and staying in motels, where Dolores often cries at night. Humbert desperately tries to maintain Dolores' interest in travel and himself, increasingly bribing her in exchange for sexual favors. They finally settle in Beardsley, a small New England town. Humbert adopts the role of Dolores' father and enrolls her in a local private school for girls.

Humbert jealously and strictly controls all of Dolores' social gatherings and forbids her from dating and attending parties. It is only at the instigation of the school headmaster, who regards Humbert as a strict and conservative European parent, that he agrees to Dolores' participation in the school play, the title of which is the same as the hotel in which Humbert met the mysterious man. The day before the premiere of the performance, Dolores runs out of the house following an argument with Humbert. He chases after her and finds her in a nearby drugstore drinking an ice cream soda. She then tells him she wants to leave town for another road trip. Humbert is initially delighted, but as they travel, he becomes increasingly suspicious. He feels that he is being followed by someone Dolores is familiar with.

Humbert increasingly displays signs of paranoia and mania, perhaps caused by his growing certainty that he and Dolores are being trailed by someone who wants to separate them. In the Colorado mountains, Dolores falls ill. Humbert checks her into a local hospital, from where she is discharged one night by her "uncle". Humbert knows she has no living relatives, and he immediately embarks on a frantic search to find Dolores and her abductor, but initially fails. For the next two years, Humbert barely sustains himself in a moderately functional relationship with a young alcoholic named Rita.

Deeply depressed, Humbert unexpectedly receives a letter from a 17-year-old Dolores, telling him that she is married, pregnant, and in desperate need of money. Humbert, armed with a pistol, tracks down her address against her wishes. At Dolores' request, he pretends to be her estranged father and does not mention the details of their past relationship to her husband, Richard. Dolores reveals to Humbert that her abductor was the famous playwright Clare Quilty, who had crossed paths with Humbert and Dolores several times. She explains that Quilty tracked the pair with her assistance, and took her from the hospital because she was in love with him. However, he later kicked her out when she refused to star in one of his pornographic films. Humbert claims to the reader that at this moment, he realized that he was in love with Dolores all along. Humbert implores her to leave with him, but she refuses. Accepting her decision, Humbert gives her the money she is owed from her inheritance. Humbert then goes to the drug-addled Quilty's mansion and shoots him dead.

Shortly afterward, Humbert is arrested, and in his closing thoughts, he reaffirms his love for Dolores and asks for his memoir to be withheld from public release until after her death. The deaths of Humbert (shortly after his imprisonment) and Dolores (in childbirth on Christmas Day 1952) have been already related in the foreword.