"The Underground City; Or, The Black Indies" by Jules Verne is a novel serialized in 1877. When mining engineer James Starr receives a mysterious letter from a former colleague, he returns to the supposedly exhausted Aberfoyle coal mine in Scotland. There he discovers the Ford family living deep underground, guarding a secret discovery that will revitalize the entire community. But strange, unexplained events begin plaguing the miners, and young Harry Ford's exploration of the caverns reveals a mysterious orphan girl who may hold the key to these supernatural occurrences. (This is an automatically generated summary.)
These books are free to read. Each is in the public domain in the United States; check your own country's rules before you copy or share one.
