In this thrilling examination of the UFO phenomenon, author Rupert Matthews assesses the growing threat of alien reconnaissance on Earth. From the earliest recorded sightings to the most recent encounters and abductions, 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 July 1947 reports arose of a flying disc outside Roswell, New Mexico, mysterious debris made of materials unknown to the public and there were even rumours of alien bodies - did the authorities try to cover up evidence of alien life? - the Rendlesham Affair - when strange lights appeared in the sky outside a US air force base in Suffolk, UK in 1980 high levels of radiation followed and local residents were inclined to ask - was this a UFO crash? - the Men in Black - many of the most committed UFO researchers have reported being visited by strange men in black suits intimidating them into stopping their work. Who are these people? And what is the information that they don't want getting out? Whether you are a firm believer in extra-terrestrial visitors to Earth or a confirmed sceptic, this book provides a balanced view of events to date and is sure to give you something to think about.