The novel is told through
narratives alternating between two time periods, and largely in the
third-person omniscient mode.
1957–1958 During a rainstorm in
Derry, Maine, a six-year-old boy named
Georgie Denbrough sails a paper boat along the rainy streets before it washes down into a storm drain. Looking in the drain, Georgie encounters a clown who introduces himself as
Pennywise the Dancing Clown. Georgie, despite knowing he should not talk to strangers, is enticed by Pennywise to reach into the drain and retrieve his boat. It then rips his arm off, and Georgie dies. The following June, an overweight eleven-year-old boy named Ben Hanscom is harassed by a bully named Henry Bowers and his gang on the last day of school, escaping into the marshy wasteland known as
the Barrens. There, Ben befriends an asthmatic hypochondriac named Eddie Kaspbrak and
"Stuttering Bill" Denbrough, Georgie's elder brother. The three boys later befriend fellow misfits
Richie Tozier, Stanley "Stan" Uris, and
Beverly Marsh, and refer to themselves as "The Losers Club". As the summer draws on, the Losers each encounter Pennywise in terrifying manifestations: a
mummy on a frozen canal to Ben, a fountain of blood (that only children can see) from Beverly's sink, a rotting
leper to Eddie, drowned corpses to Stan, and a frightening phantom of Georgie to Bill. Meanwhile, the increasingly unhinged and sadistic Bowers begins focusing his attention on his
African-American neighbor, Mike Hanlon and his father. Bowers kills Mike's dog and chases the terrified boy into the Barrens, where he joins the Losers in driving Bowers's gang off in a rock fight, leaving a humiliated Bowers promising revenge. Mike becomes a member of the Losers Club after revealing his own encounter with Pennywise in the form of a carnivorous bird. From Mike's historical scrapbook, the Losers realize that It is an ancient monster with a firm grip on the town. Following further encounters, the Losers construct a makeshift
smoke hole that Richie and Mike use to hallucinate It's origins as an ancient
extraterrestrial who came to Earth, beginning a cycle of hunting for one year followed by a 27-year-long hibernation. Eddie is hospitalized by Bowers and several of his friends, and Beverly witnesses one of the bullies, Patrick Hockstetter, consumed by It in the form of a mass of flying leeches. The Losers discover a message from It written in Patrick's blood, warning them that It will kill them if they interfere. In the hope that silver can wound It, Ben makes two silver slugs out of a silver dollar, and the Losers enter an abandoned house where Eddie, Bill, and Richie had previously encountered It to attempt to kill It. They manage to wound It with the silver while It is in the form of a
werewolf. Deeming the Losers a threat, It manipulates Bowers into murdering his abusive father, then chasing the Losers into the sewers to kill them, where his accompanying fellow bullies, Victor "Vic" Criss and Reginald "Belch" Huggins, are both killed by It. Bowers is lost in the sewers. In the sewers, Bill performs the Ritual of Chüd in an attempt to face It in the Macroverse, the alternate universe where It is from. There he meets the monster's antithesis, Maturin, an ancient turtle that created the universe. Bill learns that It can only be defeated during a battle of wills, in which he emerges victorious; in doing so, he sees Its true form, and its place of origin, the Deadlights. After the battle, not knowing if they killed It or not, the Losers get lost in the sewers. To try and regain a sense of direction, Beverly has
sexual intercourse with each of the boys. Once they are safely out, the Losers swear a
blood oath to return to Derry should the threat resurface. Bowers, having lost his sanity by the time he escaped the sewers into a nearby river, is institutionalized after being blamed for the town's child murders.
1984–1985 In July 1984, three youths brutally attack a young gay man named Adrian Mellon and throw him off a bridge, where Adrian's partner and one of the attackers both see a mysterious clown. Adrian is found dead and mutilated, and the teens are arrested and charged with his murder. When a string of violent child killings begins in Derry again, Mike Hanlon, who is now the town's librarian, calls up the six former members of the Losers Club to remind them of their childhood promise to return if the killings start again. Bill is now a successful horror writer living with his actress wife, Audra; Beverly is a fashion designer, married to an abusive man named Tom Rogan; Eddie runs a limousine rental company and has married a codependent woman similar to his hypochondriac mother; Richie Tozier is a disc jockey; Ben Hanscom has lost weight and is a successful, but single and lonely architect; and Stan Uris is a wealthy accountant. Prior to Mike's phone calls, all of the Losers had completely forgotten each other and the trauma of their childhood, burying the horror of their encounters with It. All of the Losers agree to return to Derry, except for Stan, who kills himself in terror of facing It again. The Losers meet for lunch, where Mike reminds them that the creature awakens roughly every 27 years for 12–16 months at a time, feeding on children before going into slumber again. The group decides to kill It once and for all. At Mike's suggestion, each person explores different parts of Derry to help restore their memories. While exploring, Eddie, Richie, Beverly, and Ben are faced with manifestations of It (Eddie as Belch Huggins and childhood friends in leprous and zombified forms, Richie as a
Paul Bunyan statue, Beverly as the witch from
Hansel & Gretel in her childhood home, and Ben as
Dracula in the Derry Library). Bill finds his childhood bicycle, "Silver", and brings it to Mike's. In the meantime, Audra, who is worried about Bill, travels to Derry; Beverly's husband arrives as well, intending to kill Beverly, who has finally vanquished his power over her; and Henry Bowers escapes from the mental asylum with help from It. Henry confronts Mike at the library, but Mike escapes, seriously injured. It instructs Henry to kill the rest of the Losers, but Henry is killed while attacking Eddie. It then appears to Tom and orders him to capture Audra, bringing Audra to Its lair, where Audra becomes
catatonic, and Tom, seeing It in its true form, collapses with shock. Bill, Ben, Beverly, Richie, and Eddie learn that Mike is near death and realize they are being forced into another confrontation with It. They descend into the sewers and use their strength as a group to "send energy" to a hospitalized Mike, who fights off a nurse that is under the control of It. They reach It's lair, and the clown transforms into its true form, a giant, mutated spider-like creature. Bill and Richie enter Its mind through the Ritual of Chüd, but they get lost in It. Eddie injures It by spraying his asthma medication down Its throat, using the monster's powers of imagination to believe he is spraying acid in It's mouth, which works. It bites off Eddie's arm, killing him. It runs away to tend to its injuries, but Bill, Richie, and Ben chase after and find that It has laid eggs. Ben stays behind to destroy the eggs, while Bill and Richie head toward their final confrontation with It. Bill surprises and attacks It, before managing to wound It's heart. The Spider attempts to bargain with the group, but the Losers collectively beat, stomp and
dismember the creature, killing It. The group meets up to head out of It's lair, and although they try to bring Audra and Eddie's bodies with them, they are forced to leave Eddie behind. They realize that the scars on their hands from their blood pact have disappeared, indicating that their ordeal is finally over. At the same time, the worst storm in Maine's history sweeps through Derry, and the downtown area collapses. Mike concludes that Derry is dying. The Losers return home and gradually begin to forget about It, Derry, and each other all over again. Mike's memory of the events of that summer also begins to fade, as well as any of the records he had written down previously, much to his relief, and he considers starting a new life elsewhere. Ben and Beverly leave together and become a couple, and Richie returns to California. Bill is the last to leave Derry. Before he goes, he takes Audra, still catatonic, for a ride on Silver, which awakens her from her catatonia, and they share a kiss. ==Themes==