"The Heart of Unaga" is an adventure novel by the famous writer Ridgwell Callum. The main character, Lance Dalton, goes in search of a legendary treasure in the very depths of the American range. This book is full of danger, mystery and unexpected turns of events. The author skillfully uses the shades of nature and the inner conflicts of the hero, creating an incendiary atmosphere that keeps the reader on the verge of anticipation. "The Heart of Unaga" is a book that captivates from the first lines and leaves an unforgettable impression after reading.