Have you seen an alien? Do you know what they look like? Many people have claimed that they have spotted an alien or that they have been abducted by one. In this fascinating book, a mysterious figure called the Mystery Master sets you the challenge of iinvestigating all the myths and sightings surrounding aliens and encourages you to analyse the information that you have gathered. Once you have read the information in this book, you can figure out for yourselves: Have aliens visited Earth? Part of the Top Secret! series.