They have been talking about them for more than half a century, but to no avail - ufologists cannot present not only a living alien, but even a fragment from a “flying saucer”. Why does this happen? Where might aliens be hiding? The entertaining book you are holding in your hands tells about all this and much more. Do not look for the ultimate truth on its pages. The author cites many myths, legends, hypotheses, assumptions... But the last word still remains with the reader. The book is addressed to children of middle and high school age, as well as all inquisitive readers.