"The Lost Temples of Xanthuus" is an exciting science fiction book by authors Calhoun and Howell, which tells about an expedition to the mysterious world of ancient temples. The main character, an archaeologist, goes in search of ancient secrets hidden in the ruins of Hantuus. However, the journey turns into a dangerous adventure when he encounters mysterious creatures that guard the secrets of these temples. Will the protagonist be able to uncover the secrets of Hantuus, or will he lose his life within the ancient walls? "The Lost Temples of Xanthuus" is an exciting adventure that will captivate the reader from the first pages and will not let go until the last.