On a rainy day in October, in 1988, Bill Denbrough gave his seven-year-old brother, Georgie, a paper-made boat. Georgie takes her and goes to the streets to “sail” with her in a pond, but fails to stop it in time and is drained by the sewer. Trying to get her out of it, Georgie is scared of the presence of a clown-clown young who presents himself as Pennywise Dancer Clown.
Pennywise claims his entire circus was destroyed by the storm and led him into the sewer, including him, giving Georgie his boat to attract him closer. When he approaches, Pennywise kidnaps the boy. Eight months later, in ’89, on the last day of school at Derry High School, Bill and his friends flee a group of aggressors, and at the same time, Beverly Marsh, a young woman abused by her father and harassing mercilessly around him, meets a gentle but overweight boy, Ben Hanscom, who is new to the area but secretly likes it.
While making a local butcher’s delivery to his grandfather, Mike Hanlon also met Pennywise before he was almost trampled by Henry. Bill, still troubled by Georgie’s disappearance and the inevitable neglect that he had with his equally troubled parents, discovers that his brother’s body may be in a deserted area called Barrens and takes a few friends to goes together to search.