Yesterday's Lie.Eda, King, and Hooty manage to create a temporary portal for Luz, so she can check on her mother in the Human Realm. When Luz goes inside, she ends up in a strange place filled with cubes that allows her to interact with both realms through reflections. She discovers her doppelganger, who turns out to be a shapeshifting basilisk named Vee, originally called Number Five, who was experimented on by the Emperor's Coven. She ran away from the Boiling Isles and decided to live Luz's life as Camila was so kind to her...