Nikki joins the party — and the newly formed Hawkins Investigators Club. Strange things take root at a nearby farm and shake up the Winter Festival.

The kids look for answers about the mutant creatures plaguing their town and get a helpful lesson from Mrs. Baxter, their substitute science teacher.

As a blizzard bears down on Hawkins, Dustin goes on a side quest, and Max and Lucas hear a cry for help. A bold move lands some of the gang…