It's January 1985. The Hawkins crew survived their battle with the Mind Flayer, but Will and Joyce are still reeling from the recent death of Bob Newby. Will's friends have been too busy with their girlfriends to notice how much he is struggling. After he and Mr. Clarke discover a mysterious map Bob left in a box of old nerdy memorabilia, Will rallies the crew to investigate. Is there a secret hidden in the hills of Hawkins?