"At the Heart of the Earth" is an exciting science fiction adventure book by the great master of the genre, Edgar Rice Burroughs. In the center of events is the exploration of a deep cave, which turns out to be the entrance to the secret underground kingdom of Mach. Readers, together with the main characters, experience an incredible underground world, its amazing inhabitants and mysterious relics. The journey through this amazing world is filled with dangers, the power of nature and incredible discoveries. "At the Heart of the Earth" is a book that will captivate the reader from the first pages and will not let him go until the last page, leaving behind an unforgettable impression and the desire to return to this exciting world again.