"A Test of Endurance; or, How Clear Granite Conquered" is an exciting book by author Alan Douglas, Captain. In this exciting science fiction novel, the author tells the story of brave heroes who face incredible challenges during an expedition to dangerous and unknown territories. Readers will submit to a tense atmosphere, incredible circumstances and unexpected turns of events that lead to an unforgettable ending. "A Test of Endurance; or, How Clear Granite Won" is a book that will leave you on the edge of your seat, unable to tear yourself away from its captivating pages.