In the scene, the mysterious neighbour is seen reading a book, with a pile of other books next to her.
One of the books was Kafka’s selected stories, which has given one fan an idea about what the future will hold.
Reddit user FalunGongLord began: “If the books the neighbour is reading is any clue to the tone of the third season, and Kafka e.g. metamorphosis /change is a key element, maybe it focuses on Joe changing.
“My theory is that the neighbour is his mother or potentially sister?”