the 27-year cycle

The 27-year cycle is the temporal heartbeat of Derry's horror, a recurring period of intensified violence, child disappearances, and supernatural predation that defines the town's hidden history. Every quarter-century or so, the entity known as It awakens from a dormant state and feeds on the town's children, leaving a trail of mutilated bodies and unsolved disappearances. The cycle is marked by a crescendo of horror that culminates in a catastrophic event—such as the explosion of the Kitchener Ironworks in 1906, the fire at the Black Spot in 1930, or the final confrontation with the Losers' Club in 1958—after which It returns to hibernation and the town's collective memory of the terror fades. The cycle's regularity and the town's complicity in forgetting it form the central structural principle of the novel, driving the plot from the initial murders in 1957-58 to the adult Losers' return in 1985.

The Cycle's Historical Pattern

Mike Hanlon, the town librarian and keeper of Derry's secret history, discovers that the cycle has recurred with approximate regularity for centuries. He traces it back through the town's records: the disappearance of the original settlers in 1741, the lynchings of 1877, the explosion at the Kitchener Ironworks during an Easter-egg hunt in 1906, the fire at the Black Spot in 1930, and the murders of 1957-58. Each cycle lasts roughly fourteen to twenty months, with violence escalating to a furious peak before ending in a single, spectacular catastrophe. The cycle is not perfectly exact—sometimes it comes a little sooner, sometimes a little later—but it always comes. Mike's research shows that the murder rate in Derry is six times that of any comparable town in New England, and that during the cycle years, the rate of child disappearances shoots nearly out of sight: over one hundred and seventy children reported missing in 1930 alone, and one hundred and twenty-seven in 1958.

The Mechanism of Forgetting

A crucial feature of the cycle is the collective amnesia that follows each peak. After the horror subsides, the people of Derry—and especially those who have directly confronted It—begin to forget. Bill Denbrough, who as a child led the Losers' Club against It, realizes that he has not thought of his brother George's murder in over twenty years, nor of Derry itself, nor of the friends he made there. The forgetting is not a conscious choice but a gradual erosion: "It's like having a case of amnesia so bad you don't know you've got it." The same forgetting afflicts all the surviving Losers, who have built successful adult lives with no memory of the summer they faced a monster. Mike, the only one who stayed in Derry, is the sole keeper of the memory, and he understands that the forgetting is part of It's survival strategy: children, with their capacity for total belief and imaginative faith, are the only ones who can truly harm It, but they grow up, and as adults their "perspectives have narrowed; our faith in the magic, which makes magic possible, has worn off like the shine on a new pair of shoes after a hard day's walking."

The 1957-58 Cycle and the Losers' Intervention

The cycle that begins with George Denbrough's murder in October 1957 follows the established pattern: a series of child murders and disappearances—Betty Ripsom, Cheryl Lamonica, Matthew Clements, Veronica Grogan, and others—that terrify the town and prompt a curfew. But this cycle is interrupted before its natural end. The seven children of the Losers' Club, united by their shared encounters with It and bound by a blood oath, confront the entity in its lair beneath Derry in August 1958. They do not kill It, but they wound It badly enough to force It into premature hibernation, ending the cycle months before it would have culminated in a catastrophic event. Mike notes that "all the other cycles reached their peak around September and then ended in a big way," but the 1957-58 cycle "ended quite abruptly in August of 1958." This premature termination is unprecedented, and it leaves unfinished business that will draw the Losers back twenty-seven years later.

The 1984-85 Cycle and the Final Confrontation

The cycle resumes in 1984 with the murder of Adrian Mellon, a gay man thrown from the Main Street Bridge by three teenagers and then killed by the clown under the bridge. Over the following months, nine more children are murdered in increasingly gruesome fashion. Mike, who has been watching and waiting, finally makes the calls that bring the surviving Losers back to Derry. The cycle has reached its peak, and this time the confrontation is final. The adult Losers, though diminished in number and power, complete what they began as children: they pursue It into Its lair, and Bill Denbrough tears out Its heart. The cycle is broken. In the aftermath, the town itself seems to die: downtown Derry collapses into the Canal, the Standpipe falls, and the violence that has pulsed through Derry for centuries finally ceases. The forgetting begins again, but this time it is a mercy, not a trap.

Thematic Significance

The 27-year cycle is more than a plot mechanism; it is the novel's central metaphor for the relationship between childhood and adulthood, belief and skepticism, memory and forgetting. The cycle represents the return of repressed trauma, the way that the horrors of childhood—whether supernatural or mundane—must be confronted again in adulthood if they are ever to be truly laid to rest. The fact that the cycle recurs with such regularity suggests that evil is not a one-time event but a persistent pattern that must be actively resisted. The Losers' success in breaking the cycle implies that courage, friendship, and the willingness to believe—even when belief seems foolish—are the only forces that can truly defeat the darkness. The cycle's end also suggests that Derry itself, the place that has nurtured and hidden It for so long, may finally be dying, its malignant influence fading as the last of Its power is destroyed.