The Ministry has been broken into by, it seems, an invisible man. A trail leads via inventor Quilby to the Eastern Drug Company, a front organisation run by Soviet intelligence. Meanwhile, the crack spies Elena and Alexandre Vazin are in town. But nobody has seen anything of Alexandre....
Quest roles:
Warren Mitchell(Brodney), Roy Kinnear(Happychap), John Nettleton(Sir Andrew Ford), Moira Lister(Elena), Jonathan Elsom(Ackroyd), Harvey Hall(Ulrich), David Glover(Wilton)