What did Henry find in the briefcase he opens in Stranger Things season 5? The answer isn’t in the show

Holly Wheeler (Nell Fisher) and Max Mayfield (Sadie Sink) have spent most of Stranger Things season 5 trapped in a psychic prison that Henry Creel/Vecna (Jamie Campbell Bower) built from his own memories. Their search for a way out in episode 6, “Escape from Camazotz,” leads them to relive a moment that changed Henry’s life forever — one that could hold the key to finally defeating him. But to understand exactly what happened, you either need to wait until the series finale or have seen a Stranger Things story you can’t watch on Netflix.