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.
| Directing | Tony Maylam | Director |
| Writing | Erskine Childers | Novel |
| Writing | Tony Maylam | Screenplay |
| Production | Drummond Challis | Producer |
| Sound | Howard Blake | Original Music Composer |
| Camera | Christopher Challis | Director of Photography |
| Editing | Peter Hollywood | Editor |
| Art | Hazel Peiser | Production Design |
