The Mutual UFO Network–better known as MUFON–is the world's leading organization devoted to the scientific investigation of unidentified aerial phenomena and other unexplained encounters. With more than five decades of investigations, could MUFON's extensive database contain definitive proof of extraterrestrial visitation?

The Center for the Study of Extra-Terrestrial Intelligence defines a "Close Encounter of The Fifth Kind" as direct human contact and communication with extraterrestrial life. But is this a classification that will only be useful in the distant future, or have such encounters already taken place… and within the highest levels of the U.S. government?