Buried deep beneath the outskirts of the city, the London catacombs are known for being as beautiful as they are eerie. In the 1800s, seven garden cemeteries were built outside London. Called the Magnificent Seven, they each came with special vaults called catacombs. A wave of cholera had swept London, and the catacombs were supposed to help keep the city clean and safe. But could they have made people sick too? The catacombs closed over time. But from vandalism to vampires, the cemeteries and their catacombs continued to be a hot spot for theories. Dig deep underground to learn about the London catacombs, and find out more about their sickly past, mysterious present, and possible future return. "Able readers who enjoy historical mysteries and examining all sides of stories will appreciate this series about unexplainable events. . . . Students will relish the tantalizing notion that there are things still unknown about these top secrets."― School Library Journal Megan Harder is a writer of children's nonfiction and a researcher for the University of Minnesota's potato breeding lab. She loves to learn new things and share her knowledge with others. In her free time, Megan enjoys baking, thrifting, and Brazilian Jiu-Jitsu.