London, England, during World War II. After living a tragic life experience, young Violette Szabo joins the Special Operations Executive and crosses the German enemy lines as a secret agent to aid a French Resistance group.

An amoral, psychotic playboy incites three men who are down on their luck to commit a mail van robbery, which goes badly wrong.

Lord Loam has modern ideas about his household, he believes in treating his servants as his equals - at least sometimes. His butler, Crichton, still believes that members of the serving class should know their place and be happy there. But when the Loam family are shipwrecked on a desert island with the self-reliant Crichton and lady's maid Tweeny, the class system is put to the test.

During the autumn of 1944, RAF Hudson, carrying a VIP passenger in possession of highly secret information, is shot down and ditches in the North Sea. Fighting the elements and trying to keep up morale, the occupants of the aircraft's dinghy talk about their lives awaiting the rescue they hope will come. The film's title reflects the motto of the RAF's Air Sea Rescue Service, one of whose high speed launches battles against its own mechanical problems, enemy action, time and the weather to locate and rescue the downed crew and the vital secret papers they carry.