Alternate English Titles:

Black Diamonds
Black Indies
Child of the Cavern
Child of the Cavern or Strange Doings Underground 
Underground City (The)

The old Aberfoyle mine in Scotland, that was thought to have been mined out ten years earlier is reactivated, when a dedicated old miner, Simon Ford, makes an astonishing discovery. He contacts the old manager of the mine, James Starr, and the discovery leads to a large vein of coal that will take generations to mine out. Soon the New Aberfoyle mine is opened and everyone begins to profit again; however, a mysterious "goblin" threatens the entire mine.

First UK Editon		The Child of the Cavern; or Strange Doings Underground 1877 Sampson Low, Marston, Searle and Rivington London Pictorial Brown cloth (Gray cloth shown!) Translated by W. H. G. Kingston (who also wrote the preface) Published: October 1877
First US Edition	book	The Black Indies (1877) George Munro Quarto edition of Munro's Seaside Library, No. 5 Published: May 1877
Other Editions: 1882 (not certain) Child of the Cavern 1882 Sampson Low London "Authors Illustrated Edition" [1883] Underground City or the Child of the Cavern [1883] Porter and Coates Philadelphia Translated by W. H. G. Kingston Fully illustrated green copy inscribed 1884 1883 Child of the Cavern 1883 Sampson Low London 3rd Edition 1888 The Child of the Cavern 1888 Sampson Low, Marston, Searle and Rivington London "Authors Illustrated Edition" 1892 Child of theCavern 1892 Sampson Low Marston and Co Ltd London Fourth edition nd Underground City nd Porter and Coates Philadelphia  Alta Edition brown and gray shown Black Diamonds ? ARCO Publications London Fitzroy Edition Dustjacket Black Diamonds ? Associated Booksellers Westport, Conn. Fitzroy Edition Dustjacket