Emma Trechman

Lord Windermere appears to all – including his young wife Margaret – to be the perfect husband. The couple's happy marriage is placed at risk when he starts paying visits to a mysterious beautiful newcomer, Mrs. Erylnne, who is determined to make her entry into London's high society. Worse, the secret gets back to Margaret that Windermere has been giving Mrs. Erylnne large sums of money.

David Phillips (Patrick Macnee) is running down the darkened streets of London's Limehouse district, pursued by two men with guns. He finds a public phone and puts a call through to Dick Barton (Don Stannard), but before he can report, a shot rings out. Barton must piece together what Phillips found out that got him killed. Phillips had been assigned to protect Professor Mitchell (Percy Walsh) and his new development, a ray capable of exploding any unstable element aboard an aircraft in flight. Mitchell has been targeted for kidnapping by Serge Volkoff (Meinhart Maur), a foreign agent from Eastern Europe, as part of a larger, much more sinister plot to destroy England and cripple Western Europe. Complicating matters further is that Mitchell's daughter (Joyce Linden) has also been kidnapped, and Barton must contend with Volkoff's crafty female companion Anna (Tamara Desni).