The Incan civilization practised the art of mummification. If you were a king, when you died, you would be mummified before you were placed in your tomb. You would then face an eternity of being brought out on major holy days and paraded around the city.
This book spends some time on the mummies, but also gives the reader a background on the Incan Civilization as a whole. This helps to set the context for why mummies were important. For the junior reader, there is a lot of information here for research projects and just general knowledge.
Still, there is not a lot here that makes being an Inca mummy that much worse than anything else in the Inca civilization. Maybe if they had focused instead on the child mummies, author Hynson would have been able to live up to the title.