In Hawkins, a series of mysterious events are gradually emerging.The secrets hidden in the old farm and under the Star Court Mall are chilling, and the power of the Mind Flayer is constantly building up, shrouding the entire town in an inexplicable fear.

Nancy and Jonathan, two young detectives, begin to realize that there may be a deeper connection behind a series of seemingly unrelated events.When Nancy recalls that the terrible thing that happened to Will last year is exactly the same as what is happening to Mrs. Driscoll now, she realizes that this is no accident.She and Jonathan moved quickly to find children who might have been affected by the mind flayers to ensure their safety.

During the course of in-depth investigation, they discovered that the time when Mrs. Driscoll went crazy coincided surprisingly with the time when Billy had strange changes in the sauna.This leads them to suspect that Billy and Mrs. Driscoll may not be the only ones possessed by the Mind Flayer.Heather, Tom and others also came into their sights because they had encountered similar mind-stealers in the past.

The young men soon realized that simply stopping the Mind Flayer's actions would not solve the underlying problem.They must find the source of the Mind Flayer and stop its evil deeds from the source.So they decided to return to the hospital, hoping Mrs. Driscoll could lead them to the answer.

However, when they arrive at the hospital, they find that Mrs. Driscoll has escaped and the hospital is in chaos.Many staff members are unfortunately killed, and a possessed Tom and Bruce are causing even greater trouble.In a thrilling fight, Nancy and Jonathan bravely face the two mind-flayer-controlled monsters.After a fierce battle, they finally defeated Tom and Bruce, but what was shocking was that the two monsters merged into a creepy physical monster after death.

Meanwhile, Hopper and Joyce are trying to escape Hawkins.While inspecting all the locations sold to the Star Court by the Mayor, they unexpectedly discover the secrets hidden beneath the Hess Farm.Two Russians are working in a secret underground bunker and seem to be inextricably linked to the Mind Flayer.After fighting off the Russian hunk, Hopper and Joyce manage to capture Alexei, an engineer.They hope to get more information about the Mind Flayer through Alexei, and then escape from this dangerous place as soon as possible.

However, their car broke down in the middle of the woods.Faced with language barriers and pursuit, they fell into a desperate situation.At this moment, Steve, Robin and others also walked out of the elevator and found themselves in a maze of a secret facility.Their goal is to find the broadcast communications room in hopes of contacting people in the outside world.During the search, Steve bravely knocked down a Russian officer, giving them a chance to escape.