A museum curator hires two professors (one being Dr. Joseph Bell) to publicly unwrap an Egyptian mummy, but it proves to be a man's three-week-old corpse.

Doyle assists his friend Reuben Proctor who has recently acquired an Egyptian mummy. They arrange for a gala evening at the museum where two eminent professors - Doyle's mentor Dr. Bell being one of them - will unveil the embalmed remains of the Egyptian princess and perform an autopsy. To everyone's surprise, they find not a princess but a man who was recently murdered. As they investigate, Doyle and Bell uncover a group of expatriate rebels plotting to create havoc. They work frantically to stop them before they spread terror among the population of London.

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