| Location Information
Mao's is an opium den in 19th-century London.
Eliza Simpson and Dr. Bartley visit Mao's after they find out that swords that were used in a series of murders were owned by C. Ebenezer Burns. Burns tells them that he sold them to a person with sideburns like a man in the den. Eliza and Bartley start to hunt down the man with sideburns. The cops arrive at Mao's and capture the man.