Four months after their classmate's sudden disappearance, Teddy, Phil, Lilly, and Ronnie vow to figure out why so many kids have gone missing in Derry...and why they've each been experiencing strange phenomena.

After joining Leroy at their new house in Derry, Charlotte is left with a strange feeling while running errands in town, and Will is teased on his first day of school.

When a major find yields few clues, General Shaw pushes ahead with his top-secret mission, ordering Leroy and Pauly to escort Dick Hallorann on an aerial search for a new dig site.

As the kids face increasingly terrifying experiences, Charlotte attempts to advocate for Hank, and General Shaw escalates his efforts.

As the military descends on Neibolt Street, the kids head into the sewers with their own objective.

Plagued by dark visions, Dick gets a surprise at the Black Spot. Meanwhile, the kids each face their own challenges.

A vigilante attack on the Black Spot unleashes long dormant forces. In the aftermath, Dick helps uncover another crucial artifact.

As a dense fog engulfs the town – and General Shaw pushes ahead with his mission – the Hanlons, Rose, Dick, and the kids must work together to save Derry.