The copper elephant
Adam Rapp
In a world where children under twelve are used as slave labor in subterranean lime mines, eleven-year-old Whensday Bluehouse struggles to survive the continuous poison rains and evade the ruthless Syndicate Soldiers.

by Peter Wortsman (2014)
Cold Earth Wanderers by Peter Wortsman is a science fiction novel set in a completely built up world where vertical values are prized while all horizontal tendencies are suspect. 16 year old Elgin Marble has had enough of a world that is decidedly vertical. When his father, an upstanding elevator man, is marked for disposal, Elgin joins an underground group called the Crabs. This illicit group tirelessly digs tunnels in the hope of one day breaking through to the outside. But who are the Crabs, and can they be trusted? His mother, Ellen, is worried sick about her son. The ruthless school principal, Mr. Orion, warns her that Elgin is in big trouble and blackmails her for sexual favors. Together they go underground to search for the boy. Meanwhile, agents of the IVT (Institute for Vertical Thinking) are also hot on his trail, and the Crabs are feeling the heat.
Adam Rapp
In a world where children under twelve are used as slave labor in subterranean lime mines, eleven-year-old Whensday Bluehouse struggles to survive the continuous poison rains and evade the ruthless Syndicate Soldiers.
John Christopher
In this first in a trilogy of twenty-third-century England, young Clive Anderson, unjustly imprisoned in an attempt to mold him into a docile member of society, escapes to the Outlands and is befriended by Wild Jack's outlaw band.
John Fardell
Ben, Zara, Sam, and Marcia begin their summer vacation by helping Professor Ampersand and a new friend build the Silver Turtle, a futuristic airplane, but on the day the first test flight is planned, a strange woman steals the airplane with the children inside.
Sir Arthur Conan Doyle
Being an account of another adventure of Prof. George E. Challenger, Lord John Roxton, Prof. Summerlee and Mr E. D. M alone, the discoverers of "The Lost World".