In the early years of the 20th Century, two British yachtsmen (Michael York and Simon MacCorkindale) stumble upon a German plot to invade the east coast of England in a flotilla of specially designed barges. They set out to thwart this terrible scheme, but must outwit not only the cream of the German Navy, but the feared Kaiser Wilhelm himself.

• The Rank Organisation
• Simon MacCorkindale
• Michael York
• Jenny Agutter
• Alan Badel
• Jürgen Andersen
• Michael Sheard
• Olga Lowe
• Hans Meyer