How can humans survive and prosper 1500 feet below the earth's surface? Jules Verne successfully weaves a dark yet magnificent story set in a coal mine, deep within a cavern world. Life in the mine is peaceful, with its beautiful lake and attractive homes.Yet there lurks an evil presence in the form of the Harfang owl, and fire maidens who dwell in the ruined castle. Unexplainable, malicious, and life threatening occurrences begin. Why? The wicked force could destroy the underground world and everyone in it!