The Riddle of the Sands (film)

The Riddle of the Sands is a 1979 British spy thriller based on the novel of the same name by Erskine Childers. Set in 1901, and starring Michael York and Simon MacCorkindale, it concerns the efforts of two British yachtsmen to avert a German plot to invade Britain.

The film ends with a German ship ramming and destroying Daviess yacht, killing Dollman and his wife. Clara gives evidence about Dollmans treachery to Davies and Carruthers, who make their report to the Foreign Office.Several producers and directors had tried to make a film based on the novel but the Childers family had not wanted to sell the rights. This ceased to be a problem when the novel passed into the public domain. ........

Source: Wikipedia