Lizzie thought it was all over. Will was back, the Party was safe and everything was in order. But, almost a year on, El is still missing. And the arrival of a girl and her brother shakes everything up as well, especially after Lizzie's jealousy gets involved. But the worst thing of all is Will. He escaped the Demogorgon, and the Upside Down, but something else is brewing in its depths. And the gang in Hawkins are going to need every single person to fight it.