For what purposes do UFO crews meet people? And what do other no less strange, sometimes unidentified creatures want from people when they also meet us? What problems do ghosts solve when they come into our world from the darkness of the grave? The author of the book offers his answers to these questions. It is especially valuable because it uses, in particular, materials collected by the author personally during his investigations of contact incidents, and also analyzed numerous little-known reports that flashed in the provincial press and which they tried in every possible way to silence.