Ever since pilot Kenneth Arnold on June 1947 lived the first sighting that was later made famous by the press, the problem of UFOs (from "Unidentified Flyng Objects") has become subject of the attention of all the world. Pinotti focuses on the multiple faces of the UFO puzzle, indicating in clear terms the possible answers to the enigma and revealing the more amazing backstage. One more good work from Pinotti, a must read.