Everyone in Hawkins thinks they know what monsters look like. Demogorgons. The Mind Flayer. Vecna. They’re wrong. Hidden inside your house is a tiny locked door that only opens at night, leading to a beautiful world where your button-eyed Other Mother and Other Father give you everything you’ve ever wanted. You escaped once, saving the souls of the children trapped there before you. But some doors never truly stay closed. When Vecna’s curse drags you back into the nightmare, your best friend Wybie and the Hawkins crew discover that the Upside Down isn’t the only dark world bleeding into reality. Now, with monsters on both sides and a mysterious doll that looks exactly like you, you must keep the tiny door shut before the Other Mother finds a way into Hawkins. Because Vecna wants your mind. But the Other Mother wants your soul.