n Victorian London, the Doctor and Leela are on their way to a performance by Chinese magician Li H'Sen Chiang when they come across a gang carrying away a body. At the police station, they learn that young girls have been going missing. They also meet the magician who has come to free one of his men. The man bears a tattoo of the a black scorpion, one of the greatest criminal organizations of all time. When the Doctor finds a tuft of rat hair on the dead man, he and Leela explore the sewers. At the theater, the doorman Casey and the manager Jago see what is going on in the cellar.

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