Nerdy high schooler Ronald Miller rescues cheerleader Cindy Mancini from parental punishment after she accidentally destroys her mother’s designer clothes. Ronald agrees to pay for the $1,000 outfit on one condition: that she will act as though they’re a couple for an entire month. As the days pass, however, Cindy grows fond of Ronald, making him popular. But when Ronald’s former best friend gets left behind, he realizes that social success isn’t everything.

A series of murders prompts Mike Hanlon to suspect that the supernatural menace that he and a group of friends battled as children has returned. He begins to call his friends to remind them of the oath they swore: if It returned again, they would come back to Derry to do battle again.