George Knapp brings us a detailed description of the alien abduction scenario, as described by tens of thousands of eyewitnesses/participants from all over the world. This report explains the parameters of this strange and disturbing aspect of the UFO mystery, the common characteristics as described by the people who say it happened to them, including missing time, conscious memories of encounters with unknown beings, and physical evidence on their bodies and in their homes. Also included is analysis and theories from the pre-eminent researchers in the field.