A highly secure military base sits in the middle of the Nevada Desert. What happens inside is kept top secret. Many UFO sightings have been reported nearby. Some people even say alien bodies are stored there. What really goes on behind its highly guarded fences? Explore the theories and learn why Area 51 has become one of history's greatest mysteries.About the Author: Carol Kim is the author of several fiction and nonfiction books for kids. She enjoys researching and uncovering little-known facts and sharing what she learns with young readers. Carol lives in Austin, Texas, with her family. Learn more about her and her latest books at her website, CarolKimBooks.com.