In this thrilling examination of the UFO phenomenon, author Rupert Matthews assesses the growing threat of alien reconnaissance on Earth. From Roswell to the recent release of Pentagon material, the book sifts through the evidence and asks the crucial questions: have aliens really visited Earth? Why do they come?

Inside, you will find detailed discussions on such mysterious events as:
- The Roswell Incident in 1947, where reports arose of a flying disc outside Roswell, New Mexico.
- The Rendlesham Forest Incident in 1980, when strange lights appeared in the sky outside a US air force base in Suffolk, UK, followed by high levels of radiation.
- Betty and Barney Hill, who were reportedly abducted on Highway 3

Whether you are a firm believer or a confirmed sceptic, this book lays out several incredible cases that will give you lots to consider, as well as latest developments such as the Pentagon files.