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Lina receives an anonymous letter with a photograph of an unfamiliar house by a forest, along with a cryptic note claiming she used to live there and warning her not to tell anyone she remembers. Before she can process it, an unknown caller asks if she received "it," hinting that someone is watching her reaction.
After receiving a parcel from her missing brother Eli, Mara finds a brass key and an unmarked train ticket instructing her to meet at midnight. At the near-empty station, a dark train arrives; the key warms as a door opens and someone speaks her name from inside.
Eliza finds a letter in her mother’s handwriting dated tomorrow, holding a key and a warning to wait for two lighthouse blinks. The light flashes once as a familiar voice knocks, leaving her unsure whether to open the door.