Personnel Officer Drew Heriot returns to England after working in Australia to discover his brother behaving oddly, to the distress of his sister-in-law Anne. Investigating together they discover that a disembodied alien force is using high frequency signals to brainwash people - including Drew's brother - into committing subversive acts, as a prelude to a full-scale invasion. Together, Drew and Anne battle to stop the acts of sabotage while trying to alert the authorities to the danger...

Genres

Cast

Jeremy Wilkin

Drew Heriot

Denis Quilley

Rosemary Nicols

Anne Heriot