[2] A newspaper journalist, Stanley Lane (Boyd Irwin), discovers a German spy ring in Sydney led by Carl Hoffman (Charles Villiers).
With the help of half-caste Samoan girl Kana (Alma Rock Phillips) he escapes and destroys a German wireless station in Samoa.
Later, HMAS Sydney invades the island and Hoffman runs into the swamp and is eaten by crocodiles.
[4][5] It was mostly shot in and around Sydney with some scenes at an aboriginal mission at Brewarrina in northern New South Wales.
Some fine natural scenery has been secured for many of the sections, and the Sydney-Emden fight has been cleverly worked out.