Scarlett (Perdita Weeks), a professor at the University of London, has professional degrees in archaeology and semiotics at a young age, and is proficient in four languages. Her father was once devoted to the exploration and research of the Philosopher's Stone, but sadly died in the end. Scarlett, who inherited her father's will, found the legendary Rose Key in a tomb in Iran that was about to be blown up in a recent adventure. This key discovery can help her find clues to the Philosopher's Stone. In order to achieve this goal, she invited Benji (Edwin Hodge) to take the photography recorder, and asked George (Ben Feldman), who had been with her through life and death, to serve as a translator. These daring young people then tried to break into the Paris catacombs where six million bodies were buried, and the terrifying experience began...