"The Motor Boys on Thunder Mountain; or, The Treasure of the Blue Rock" is an exciting adventure novel by the famous writer Clarence Young. The main characters, young friends, set out on the island's final thought journey through the mountains. They will have to face the difficult tests of nature, solve mysteries and reveal the secrets of the past. Will they be able to find the Treasure of the Blue Rock and cope with all the difficulties that await them in the whirlwind of a great adventure? This exciting story is full of danger, surprises and incredible discoveries that will not leave any reader indifferent.