The Doctor and Peri find themselves in the Museum of Aural Antiquities, where every sound is stored for posterity—from the speeches of Visteen Krane to security service wiretaps and interrogation tapes. But they also find an intruder, mysteriously changed recordings, and a dead body.
Before long the Doctor realizes that there is more going on than a simple break-in or murder. How can he defeat a creature that is made of pure sound?
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