Aliens are among us! They look like us, assume our identities - almost - they can be identified because they are mirror images. Only one man, David Vincent, has stumbled across this terrifying secret. While single-handedly fighting against the "invaders", he tries to convince others. This was the basis for a hit TV series in the 60s. This book is from 1967 and is an official "authorised TV adventure". 212 pages. Very good condition.