In 2022, the Thirteenth Doctor, Yaz, and Dan each work their way around a town, brandishing a "missing girl" poster and asking passers-by if they have seen a girl called Brianna because her mum is scared. Later, the trio meet up and share that none of them have been successful in finding any information. However, they turn to a nearby alley wall and notice three more "missing" posters alongside one advertising a Roman Empire-themed party and another advertising the Hydra's Gate History Society's ghost tour of the nearby Hydra Hall. Wondering if they are relevant, the Doctor and Dan decide to visit the hall while Yaz goes party hunting.